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1 200 OK date: Thu, 02 Jul 2026 14:06:53 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 13:03:36 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 18:46:41 GMT server: mw-web
1 200 OK date: Fri, 03 Jul 2026 00:09:30 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 17:35:33 GMT server: ATS/9
1 200 OK date: Wed, 01 Jul 2026 15:56:14 GMT server: mw-web
[ citation needed ] The prerequisite knowledge arose from intensive research and experimentation in several telecommunication fields, notably electrical telegraphy , telephony , radio , and television
1 200 OK date: Fri, 03 Jul 2026 00:09:07 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 13:24:47 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 19:46:45 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 13:25:01 GMT server: mw-web
1 200 OK date: Wed, 01 Jul 2026 23:31:35 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 00:46:23 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 02:29:00 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 13:04:02 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 17:36:05 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 13:56:58 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 06:22:42 GMT server: mw-web
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1 200 OK date: Fri, 03 Jul 2026 00:09:41 GMT server: mw-web
1 200 OK date: Fri, 03 Jul 2026 00:10:28 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 19:47:53 GMT server: mw-web
1 200 OK date: Fri, 03 Jul 2026 06:48:17 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 05:05:56 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 13:51:07 GMT server: ATS/9
1 200 OK date: Thu, 02 Jul 2026 19:46:24 GMT server: mw-web
1 200 OK date: Fri, 03 Jul 2026 06:26:03 GMT server: mw-web
1 200 OK date: Thu, 02 Jul 2026 01:56:35 GMT server: mw-web
Wayback Machine Show dark mode logo Show light mode logo Type of site Archiving service Founded October 25, 2001 ; 24 years ago  ( 2001-10-25 ) [ 1 ] Area served Worldwide ( except China and North Korea ) Owner Internet Archive URL web