File:WJZ coaxial feedline 1937.jpg

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WJZ_coaxial_feedline_1937.jpg ‎(535 × 403 pixels, file size: 30 KB, MIME type: image/jpeg)

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Description
English: Early 10 inch coaxial cable feedline for radio station WJZ in 1937. It was designed to handle 2 MW.
Date
Source Retrieved March 18, 2014 from Edmund A. Laport, Radio Antenna Engineering, McGraw-Hill Publishing Co., New York, 1952, p. 464, fig 4.75 on David Platt's webpage for this book
Author Unknown authorUnknown author
Permission
(Reusing this file)		 The copyright for this book Radio Antenna Engineering should have been renewed in 1980. A search of the US Copyright Office online database covering 1978 to the present shows no copyright renewal for that author name or title. Therefore the copyright was not renewed and the book is in the public domain.

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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.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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current16:15, 28 March 2015Thumbnail for version as of 16:15, 28 March 2015535 × 403 (30 KB)Chetvorno (talk | contribs)User created page with UploadWizard

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