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Telegram profile photo for engineeringvideos

Channel

engineeringvideos

@engineeringvideos

On this record: Topic · Observations · Channels linked by matching posts · Growth · Engagement · What this channel posts · Posts · Posts recorded as deleted · Citations · Telegram's recommendations · Cite this entry

10,129subscribers

-77 since we began measuring on 5 August 2026

Risers and fallers across the register · movement among entries of 10,000–31,623.

Register entry

Telegram ID-1001014627198
TypeChannel
Username@engineeringvideos
Description@NDTMAN بزرگترین کانال فیلم های مهندسی پیج اینستاگرام ما: instagram.com/_u/Techtofun 🥇برای تبلیغات تماس بگیرید Creator : @weldinginspector Contact: @NDTMAN
CreatedBetween 1 December 2015 and 31 March 2016 — estimated from Telegram’s id allocation, not measured. How this range is calculated.
First recorded6 August 2026
Last confirmed live9 November 2026
Measurements held51
Confirmed unchanged1 time, most recently 9 November 2026
On Telegramt.me/engineeringvideos

Topic

Other / unclassifiable — a classification, not a measurement. An on-box language model (Qwen3.6-35B-A3B-UD-Q6_K_XL, prompt version 1) read this channel’s own recent posts on 19 August 2026 and assigned it the closest of 31 fixed categories, at 62% confidence. This is a model’s judgement about what the channel is likely to be about, not a fact this register measured the way a subscriber count or a view count is measured — it can be revised on a later pass, and it carries no weight anywhere else on this page. How this classification works, and the other topics.

Observations

These are measurements, not verdicts. Each one below states something we counted, alongside the evidence it was counted from, so you can check it rather than take it. None of them is graded: every observation this register holds is recorded at severity 0, because the precision of the detectors behind them has not been measured yet, and a rating we cannot support is worse than none. Read each as a fact about the data, not as a judgement about the channel. How we measure.

Content that also appears on other registered channels

Posts published here appear in near-verbatim form on 3 other registered channels. This entry also sits inside a group of 4 channels linked by matching posts, directly or through other channels in the group; two members of the group may share no posts with each other. The matching is on the text itself, not on Telegram’s forward marker, so it finds a copy whether or not it was labelled as one.

Matching posts — open both and compare (3 of the pairs behind the counts below)
Posted firstThenOverlapGap
@kingraptor/177167 Jun 2026, 15:22 UTC@engineeringvideos/26308 · this entry7 Jun 2026, 15:22 UTC1.00under a minute
@How_It_Made/195827 Jun 2026, 15:22 UTC@engineeringvideos/26308 · this entry7 Jun 2026, 15:22 UTC1.00under a minute
@EngPics/258147 Jun 2026, 15:22 UTC@engineeringvideos/26308 · this entry7 Jun 2026, 15:22 UTC1.00under a minute
Channels this entry shares post bodies with, where at least one matching post pair has no forward credit between the two channels, or to a common source, recorded in our data
ChannelMatching postsText overlapTypical gapPublished first
@kingraptor6 (6/6 hand-verifiable sample passed)1.00under a minute@kingraptor (5–1)
@How_It_Made7 (7/7 hand-verifiable sample passed)1.00under a minute@How_It_Made (7–0)
@EngPics7 (7/7 hand-verifiable sample passed)1.00under a minute@EngPics (5–2)

Text overlap is the Jaccard coefficient over the set of distinct three-word phrases in the two bodies: 1.00 is identical wording, and the threshold for counting a pair at all is 0.70. Candidates are generated by simhash LSH (4 x 16-bit bands, exact Hamming <= 3) verified against the bodies with Jaccard over the SET of distinct 3-word shingles. Published first counts which side of each matching pair carries the earlier timestamp — in this corpus, which is the limitation directly below.

What this cannot establish

MEASURED, DOMINANT ERROR SOURCE: a post ingested before 2026-08-06 may have carried a forward header that was not recorded. A 45-pair hand-check against live t.me pages found 14 (31%) where the live page shows a forward header naming the other channel and the database has none, plus 4 more (9%) naming a third party. The text match itself was wrong 0 times out of 45. Read attribution_capture.items_in_trusted_window before treating the unattributed count as a claim.

Telegram lets a channel forward a post with a header naming the source, and we only began reliably recording that header on 2026-08-06. None of the 1 matches recorded here fall after that date, so for this entry we cannot say whether any of them carried a credit. The duplication is measured; the absence of attribution is not.

“Published first” means first in this corpus. We hold 35 comparable posts for this entry, running 26 February 2026 to 9 November 2026. A channel we have read one page deep will look younger than a neighbour we have read in full, and the order would flip with no change in the underlying facts.

The detector’s own notes on this observation, as it recorded them. Names in this_style are fields of the underlying evidence record, which the plain-English paragraphs above read out for this entry.

  • Verbatim republication has three causes and the text separates only two: a clone/mirror, unattributed copy-paste, or BOTH channels copying a common third source that neither attributes. The spread filter (content held by at most 8 channels) reduces the third and does not remove it.
  • 'Earliest' means earliest IN THIS CORPUS. A channel ingested one page deep will look younger than a neighbour ingested in full; corpus_coverage above is there to be checked before the direction is believed.
  • shared_verified_est extrapolates the sampled pass rate over the full narrow match count; sampled/passed are the numbers actually measured.
  • Absence of a forward header is not proof of intent: Telegram lets a channel disable forward attribution, and a credit written in the body is not parsed as attribution here (mention_edge_either_way above is the closest available signal).

Of the group of 4 channels, the one whose matching posts we hold earliest is @How_It_Made. That is a statement about our reading window, not a claim of authorship.

Recorded under the keys clone_copy · clone_mutual, last confirmed 11 November 2026. An observation that a later pass no longer finds is cleared, and a cleared observation is removed from this page rather than being shown struck through — we do not keep publishing a claim we have withdrawn. Dispute an observation.

Channels linked by matching posts

This channel is in a group of 4 registered channels linked by matching posts, directly or through other channels in the group. This channel may share no posts with some of the channels listed below, and listed channels may share none with each other. Links are found by comparing text fingerprints across every channel on the register.

Which channel, if either, published first is deliberately not shown in this list. “First” could only mean first in our own crawl, which depends on how deep we happened to reach into each channel’s history, not on when the content was actually first posted. Our one hand-check read 45 of the highest-confidence flagged pairs against the live Telegram pages. In 18 of them the live page showed a “Forwarded from” credit that our database had no record of, so reading that pair as an unattributed copy was wrong; the check did not measure who published first. This list is ordered by subscriber count, the same as every other listing on this site, never by which channel we think came first. Near-verbatim matching has several ordinary explanations besides copying — a channel mirroring itself, an unattributed repost, or two channels independently repeating the same wire story — and this measurement cannot tell those apart. How this is measured.

Growth

10,12910,20610,167.55 August 2026 — 10,206 subscribers6 August 2026 — 10,206 subscribers7 August 2026 — 10,205 subscribers8 August 2026 — 10,203 subscribers9 August 2026 — 10,199 subscribers10 August 2026 — 10,198 subscribers11 August 2026 — 10,196 subscribers12 August 2026 — 10,195 subscribers15 August 2026 — 10,189 subscribers16 August 2026 — 10,188 subscribers17 August 2026 — 10,187 subscribers18 August 2026 — 10,189 subscribers19 August 2026 — 10,187 subscribers23 August 2026 — 10,185 subscribers26 August 2026 — 10,184 subscribers27 August 2026 — 10,186 subscribers30 August 2026 — 10,183 subscribers31 August 2026 — 10,182 subscribers1 September 2026 — 10,181 subscribers2 September 2026 — 10,179 subscribers3 September 2026 — 10,178 subscribers8 September 2026 — 10,175 subscribers11 September 2026 — 10,173 subscribers13 September 2026 — 10,171 subscribers14 September 2026 — 10,170 subscribers16 September 2026 — 10,167 subscribers18 September 2026 — 10,165 subscribers1 October 2026 — 10,155 subscribers6 October 2026 — 10,152 subscribers10 October 2026 — 10,151 subscribers13 October 2026 — 10,152 subscribers15 October 2026 — 10,150 subscribers18 October 2026 — 10,149 subscribers19 October 2026 — 10,147 subscribers20 October 2026 — 10,146 subscribers21 October 2026 — 10,145 subscribers22 October 2026 — 10,141 subscribers23 October 2026 — 10,140 subscribers25 October 2026 — 10,141 subscribers26 October 2026 — 10,140 subscribers28 October 2026 — 10,139 subscribers29 October 2026 — 10,137 subscribers30 October 2026 — 10,136 subscribers31 October 2026 — 10,135 subscribers1 November 2026 — 10,134 subscribers3 November 2026 — 10,133 subscribers4 November 2026 — 10,131 subscribers5 November 2026 — 10,130 subscribers7 November 2026 — 10,133 subscribers8 November 2026 — 10,132 subscribers9 November 2026 — 10,129 subscribers5 August 20269 November 2026
51 measurements spanning 96 days, net -77. Dots are measurements; the straight line between them is drawn to join them, not to claim we know the path taken in between — snapshots are recorded only when a count changes, so gaps mean “no change observed”, never “interpolated”. The vertical axis spans 10,117–10,218 and does not start at zero.
Measurement log — every subscribers count we have recorded, most recent 20 of 51
Measured (UTC)SubscribersChange
9 Nov 2026, 20:5510,129-3
8 Nov 2026, 11:1510,132-1
7 Nov 2026, 08:5610,133+3
5 Nov 2026, 08:4510,130-1
4 Nov 2026, 08:4010,131-2
3 Nov 2026, 11:3110,133-1
1 Nov 2026, 07:0610,134-1
31 Oct 2026, 06:3510,135-1
30 Oct 2026, 06:1110,136-1
29 Oct 2026, 06:1810,137-2
28 Oct 2026, 01:3810,139-1
26 Oct 2026, 23:2010,140-1
25 Oct 2026, 20:2010,141+1
23 Oct 2026, 18:1810,140-1
22 Oct 2026, 18:5510,141-4
21 Oct 2026, 13:3710,145-1
20 Oct 2026, 08:0610,146-1
19 Oct 2026, 08:0410,147-2
18 Oct 2026, 05:5610,149-1
15 Oct 2026, 05:3710,150first reading

Engagement

73 posts held, back to 21 December 2025 — the reader has not yet reached the start of this channel’s public history, so older posts may sit further back, unread. Read across 55 pages of Telegram’s post history, 20 posts per page.

ERR · 30 days
1.55%
avg views ÷ 10,129 subscribers
Avg views / post
157
15 posts measured
Reaction rate
—
this channel exposes no reaction counts
Posts in window
15
of 73 held

ERR is average views per post over the last 30 days divided by subscribers, the definition TGStat uses, so this figure is comparable with the one you will see elsewhere. It falls structurally as a channel grows: a high ERR on a small channel and a low one on a large channel describe reach mathematics, not quality. We publish the figure and the sample it came from and pass no verdict on it.

ER is defined industry-wide as (forwards + reactions + comments) ÷ views — note the denominator is views, not subscribers. Telegram’s public web preview carries views and reactions but not forward or comment counts, so the reaction rate above is the reactions term only and is therefore a floor: the true ER for this channel is higher by an amount we have not measured and will not estimate.

What these figures were computed from
WindowRolling 30 days · latest post in window 11 November 2026
Posts held73 (21 December 2025 – 11 November 2026)
Views total2,362
Reactions total—
Forwards / commentsnot exposed by the public surface — not measured, not estimated
Readings taken11 Nov 2026, 10:43 UTC

Views are a single reading per post, taken at the time above. A post published in the last day or two is still accumulating views, which pulls the 30-day average down slightly. That is a property of the standard definition rather than a fault in it, so we keep the definition rather than “correcting” the number into something nobody can reproduce.

Precision. Telegram publishes view counts on its public widget in short form — 8.12K, 3.7M — so any reading at or above 1,000 reaches us rounded to three significant figures, and only counts below 1,000 are exact. Averages and rates derived from them are shown to the same precision rather than to the unit: a figure like 3,701,250 would assert digits nobody measured.

Reaction counts are published per emoji and rounded the same way, so a total below 1,000 is exact and a larger one is a sum that may carry a rounded component from each emoji above 1,000. Because it is a sum, it does not look rounded — read a large reaction total as three significant figures per contributing emoji rather than as the figure it prints.

What this channel posts

Photos
≈112
Videos
≈6,610
Links
≈103

Lifetime counters from Telegram’s own channel header, read 11 November 2026 — not the date at the top of this page, which is when the subscriber count was last read. A count marked ≈ was rounded by Telegram before we ever saw it — t.me prints these counters in full below 1,000 and to three significant figures above, so ≈142,000 means somewhere between 141,500 and 142,499.

Video runtime
1h 25m
Average length
3m 53s

Measured directly from 22 videos with a duration reading, out of the posts we hold for this channel — not this channel’s whole posting history, only the sample this register has actually read. An exact reading to the second, taken from the post itself rather than from Telegram’s own rounded chrome, so it carries no ≈ mark.

Recent posts

Telegram’s own ‘edited’ marker: 0 of 15 posts held from the last 30 days (0%) carried it when this register last read them. The marker says a post was changed after publishing, not what it said before — this register holds the earlier wording only where an edit fell between two of its own reads (see the edit ledger and how it is measured).

11 Nov 2026, 09:10 UTC28 viewsread 11 November 2026
Forwarded from @hashtagads_viewPhoto

بورسیه‌ی ۲۰۰۰ دلاری دانشگاه هاروارد با مکتب‌خونه 🎉 مکتب‌خونه به مناسبت تولد ۱۵ سالگیش یک قرعه‌کشی ویژه برگزار کرده؛ از بورسیه دوره آموزشی دانشگاه هاروارد به ارزش ۲۰۰۰ دلار گرفته تا اشتراک ChatGPT Plus و مکتب‌خونه داره جایزه میده. 🔥 علاوه بر جوایز قرعه‌کشی، تخفیف‌های ویژه تولد مکتب‌خونه هم فعال شده: ▪️ ۸۰٪ تخفیف اشتراک یک‌ساله ▪️ تا ۷۰٪ تخفیف دوره‌های آموزشی ⏳ مهلت: تا ۲۲ آبان 🔗 برای مشاهده جوایز و شرایط شرکت در…

11 Nov 2026, 09:10 UTC32 viewsread 11 November 2026
Forwarded from @How_It_MadeSticker

Sticker, posted without a caption

9 Nov 2026, 11:50 UTC73 viewsread 11 November 2026
Forwarded from @gostarde_segalPhoto

🧩ایده هنوز روی کاغذ است؛ بقیه تیم منتظر فایل توست. قرار است قطعه مدل شود، تحلیل شود یا برای قالب‌سازی آماده شود؟ ابزار یادگیری‌ات را با خروجی موردانتظار پروژه هماهنگ کن. 🖥 طراحی و مدل‌سازی در #نماتک: سالیدورک🔹سالیدورک پیشرفته🔹کتیا🔹کتیا پیشرفته 🔹اینونتور 📊 تحلیل: آباکوس🔹آباکوس پیشرفته ⚙️ قالب: طراحی قالب تزریق پلاستیک🔹طراحی قالب با کتیا 👇با فکر کردن به فایلی که باید تحویل بدهی، آموزش را انتخاب کن. 🌐 برای دریافت جز…

9 Nov 2026, 08:14 UTC85 viewsread 11 November 2026
Forwarded from @gostarde_segalPhoto

⚙️قبل از زدن Cycle Start، چند تصمیم مهم گرفته‌ای؟ ابزار، مسیر حرکت و شرایط برش، روی نتیجه کار اثر دارند. برای آن لحظه‌ای یاد بگیر که باید برنامه را به قطعه قابل قبول تبدیل کنی. 🏭کنار دستگاه، با آموزش‌های #نماتک: سی ان سی🔸دستگاه تراش یونیورسال🔸ابزارهای برشی🔸سی ان سی چوب 🛠 مسیر ابزار و برش: پاورمیل🔸ProNest و Metalix 👇👇👇دستگاه یا نرم‌افزار خودت را انتخاب کن: 🔗 جهت مشاهده آموزش‌ها و خرید اینجا کلیک کنید. 🎥آموزش آنلای…

8 Nov 2026, 18:43 UTC43 viewsread 8 November 2026
Photo

پرداخت قسطی، دفاعتو بیستی 😎🎓 ✨مشاوره مقالات کنفرانسی، علمی پژوهشی و ISI ✨مشاوره پایان نامه و پروپوزال ✨مشاوره نگارش و چاپ کتاب ✨مشاوره خدمات جانبی (فرمت بندی، ویراستاری و پاورپوینت) ✨پروژه‌های سازمانی و ارتقا رزومه 📚گروه تحقیقاتی ایران سرچ ارائه دهنده خدمات جامع و کاربردی دانشجویی و دانشگاهی "قدیمی ترین مرکز خدمات دانشجویی در شمال شهر تهران" در هر شرایطی کنار شماییم 🫂✨ 🔥 امکان پیشبرد اقساطی پروژه‌ها با ضمانت کیفیت…

8 Nov 2026, 17:35 UTC127 viewsread 11 November 2026
Forwarded from @hashtagads_viewPhoto

📊 دوره آنلاین و جامع #علم_داده (Data Science) 👈 ورود به دنیای Data Science و هوش مصنوعی 🔰 بدون نیاز به سابقه برنامه‌نویسی از مفاهیم پایه تا تحلیل داده و پیاده‌سازی مدل‌های واقعی 🐍 آموزش پایتون (Python) و SQL Server 📊 تحلیل و مصورسازی داده 🤖 یادگیری ماشین (ML) و Deep Learning 📈 پیش‌بینی و تحلیل سری‌های زمانی 🧩 پروژه‌ها و Case Studyهای واقعی 👥 مناسب دانشجویان، تحلیلگران و علاقه‌مندان به ورود یا تغییر مسیر شغلی به …

8 Nov 2026, 17:35 UTC135 viewsread 11 November 2026
Forwarded from @How_It_MadeSticker

Sticker, posted without a caption

6 Nov 2026, 19:43 UTC159 viewsread 8 November 2026

اگه هنوز حساب بلوبانک نداری این فرصتو از دست نده چون هدیه دعوت از دوستانو کردن ۳۰۰ تومننننن😳 فکر کن ۱۰ نفرو دعوت کنی میشه ۳ میلیون پول چی از این بهترررر؟ سریع دوستاتونو با کد دعوتتون به بلو دعوت کنین اگه هم حساب ندارین با دعوت من وارد شین 😍 NORBSA

3 Nov 2026, 16:56 UTC176 viewsread 7 November 2026
Forwarded from @hashtagads_viewPhoto

👈 ثبت‌نام اولین بوت‌کمپ جامع طراحی سایت با وردپرس +هوش مصنوعی 🤖مکتب شریف شروع شد 😍 💻 توی این دوره یاد می‌گیری چطور با قدرت وردپرس و سرعت ابزارهای هوش مصنوعی، سایت‌های فروشگاهی و شرکتی فوق‌حرفه‌ای بسازی و وارد بازار کار و فریلنسری بشی 💼 👈 ثبت‌نام اولین دوره طراحی سایت با AI "با امکان پرداخت ۴ ماهه و اعتبار اسنپ‌پی + استعدادسنجی رایگان" ❗️گفتگو با مشاور ثبت‌نام هوشمند‌‌‌‌ مکتب 🔽 🆔 @MaktabSharif_Admin 📱 کانا…

3 Nov 2026, 16:56 UTC159 viewsread 7 November 2026
Forwarded from @How_It_MadeSticker

Sticker, posted without a caption

1 Nov 2026, 14:09 UTC219 viewsread 6 November 2026
Photo

✅این کارت‌های جدید بلوبیزنس رو دیدین ؟ 💙بلوبانک برای کسایی که کسب و کار دارن یه حساب جدا به اسم بلوبیزنس در نظر گرفته که تو همون اپ بلو، میتونین حساب بیزنس‌تون رو در کنار حساب شخصیتون مدیریت کنین و دخل و خرجاتون قاطی نشه. و یه چیزی که توجهم رو جلب کرد کارت جداگانه‌ش بود. اینکه یه کارت مخصوص کسب‌و کارت داشته باشی و حساب‌ کتابش رو از زندگی شخصیت جدا کنی، واقعا ایده کاربردی‌ایه. 🧑‍💻به نظرم اگه شما هم یه کسب و کار دار…

31 Oct 2026, 16:39 UTC151 viewsread 3 November 2026
Forwarded from @hashtagads_viewPhoto

🎯 دوره یک‌ساله مدیریت کسب‌وکار یک دوره جامع، تخصصی و کاربردی برای مدیران، کارشناسان، صاحبان کسب‌وکار و افرادی که به دنبال توسعه مهارت‌های مدیریتی و ارتقای توانمندی‌های حرفه‌ای خود هستند. ✅ ۲۵۰ ساعت آموزش تخصصی و کاربردی ✅ برگزاری کلاس‌ها پنج‌شنبه‌ها ✅ برگزاری حضوری و آنلاین به‌صورت همزمان ✅ ارائه گواهینامه معتبر از دانشگاه تهران 💰 شهریه دوره: ۴۸ میلیون تومان 📚 سرفصل‌های دوره 🔹 مدیریت استراتژیک و طراحی مدل کسب‌وکا…

Showing the 12 most recent of 73 posts we hold for @engineeringvideos. View and reaction counts are the latest single reading for each post, not a live figure, and a recent post is still accumulating both. A view count marked ≈ was rounded by Telegram before we ever saw it — t.me prints views in full below 1,000 and to three significant figures above, so ≈1,200,000 means somewhere between 1,150,000 and 1,249,999. Unmarked counts are exact. Text is reproduced from the public post preview and truncated for length.

Posts recorded as deleted after publishing

We recorded 5 posts on @engineeringvideos as deleted — posts this register held that were missing from the channel’s public page on two separate reads, taken from different network addresses at least an hour apart.

A deletion is not wrongdoing. This register can see that a post it held is no longer on the channel’s public page, and when — not why. Expired ad placements, reposts, rotating links and corrections all look the same. This is a count of recorded detections, not an exact total: it misses deletions we could not see, because only a post we held and later re-read inside the page can be seen to go, and it may include a small number of wrong records. How this is measured.

First seen missing
12 August 2026
Most recent seen missing
12 August 2026
Median time before seen missing
5 days
Seen missing in the last 30 days
0

Forward network

Built only from forwarded posts we have actually read, on both sides. Coverage is early and deliberately incomplete: a missing link means we have not read the post that would prove it, never that the relationship does not exist. Counts are distinct forwarded posts observed, so they only ever go up as we read more.

Mentions

A mention is a weaker signal than a forward and is counted separately for that reason — naming a channel is not republishing it, and a handle in a post body is easy to place deliberately. The post counts beside each row below are distinct posts in which the handle appeared, from posts we have read on both sides — the “Named by N registered channels” figure above is a different count, of distinct NAMING CHANNELS rather than posts, and is not the sum of the rows under it.

Appears in Telegram’s recommendations for other channels

The reverse of the list above, and a different kind of signal. This does not require this channel to have ever been asked about directly — each row below is a channel we DID ask Telegram about, whose Telegram-generated list happened to include this one. A channel can appear here with an empty list above it, because being named by someone else’s query is independent of having been queried itself.

How It's Made
@How_It_Made · 26,779
Telegram ranks this channel #10 of 75 here — alongside 74 others — read 11 September 2026
️Mechanical 3Design Accademy™آکادمی طراحی سه بعدی و نقشه کشی صنعتی،مهندسی مکانیک - ساخت و تولید- ماشین سازی
@cad_3d · 22,279
Telegram ranks this channel #20 of 79 here — alongside 78 others — read 20 September 2026
تقویت زبان - آموزش آیلتس
@BestIELTS · 23,944
Telegram ranks this channel #20 of 58 here — alongside 57 others — read 16 September 2026
Mechanical Engineering ( ut_redc)
@Mech_Engineering · 24,711
Telegram ranks this channel #26 of 89 here — alongside 88 others — read 15 September 2026
مهندسی مکانیک
@Mechanical_Eng · 33,578
Telegram ranks this channel #40 of 94 here — alongside 93 others — read 4 September 2026
badtq
@badTQ · 69
Telegram ranks this channel #48 of 54 here — alongside 53 others — read 4 September 2026

This channel appears in 6 seed channels' Telegram-generated recommendation lists in total. Each is Telegram’s list for THAT channel, not this one — see how this is measured.

Cite this entry

A live page changes as we take new readings, so a citation should name the measurement it is based on, not just the URL. The line below cites the subscriber count as measured 9 November 2026 — this entry's latest reading, not the date you are reading this.

“engineeringvideos” (@engineeringvideos), 10,129 subscribers as measured 9 November 2026. Telegram Register, tgregister.com/channel/engineeringvideos.

Full measurement history, CC BY 4.0. Every reading this register holds for this entry, not just the latest one, as a dated, downloadable record: CSV · JSON. Free to use with attribution to tgregister.com. Each file carries its own generation timestamp, which is the figure to cite for exactly when the data was retrieved.