Jump to content

File:AT&T coaxial trunkline 1949.jpg

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (657 × 664 pixels, file size: 199 KB, MIME type: image/jpeg)

Summary

Description
English: Cross section of long distance AT&T coaxial cable trunkline used after World War 2 to carry telephone calls and television programs between cities. It consists of 8 coaxial subcables surrounding supporting steel strands. Each coax subcable could carry 500 telephone conversations or one television channel. This was installed January 16, 1949 between Philadelphia and Cleveland to link AT&T networks on East Coast with the Midwest.
Date
Source Retrieved July 3, 2014 from Robert Hertzberg, "Coaxial cable joins east and midwest TV networks" in Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 8, No. 2, February 1949, p. 19 on American Radio History website
Author Robert Hertzberg
Permission
(Reusing this file)
This 1949 issue of Tele-Tech magazine would have the copyright renewed in 1977. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1976, 1977, and 1978 show no renewal entries for Tele-Tech. Therefore the copyright was not renewed and it is in the public domain.

Licensing

Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.

العربية  Deutsch  English  español  français  galego  italiano  日本語  한국어  македонски  português  português do Brasil  русский  sicilianu  slovenščina  українська  简体中文  繁體中文  +/−

Flag of the United States
Flag of the United States

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

February 1949

image/jpeg

48f8f2ad62a8240381e06874e0b6ed07ffa6f281

203,953 byte

664 pixel

657 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current14:58, 2 May 2021Thumbnail for version as of 14:58, 2 May 2021657 × 664 (199 KB)MaterialscientistFFT
19:32, 28 March 2015Thumbnail for version as of 19:32, 28 March 2015657 × 664 (101 KB)ChetvornoUser created page with UploadWizard

The following page uses this file:

Global file usage

The following other wikis use this file: