File:WNBC-AM early coaxial feedline.jpg

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Beskrivelse

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Beskrivelse
English: Early coaxial cable feedline for 50kW AM radio station WNBC, Port Washington, New York.
Dato
Kilde Retrieved March 28, 2015 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
Forfatter Edmund Laport
Tilladelse
(Genbrug af denne fil)		 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.

Licensering

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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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nuværende28. mar. 2015, 16:39Miniature af versionen fra 28. mar. 2015, 16:39722 × 621 (104 KB)Chetvorno (diskussion | bidrag)User created page with UploadWizard

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