File:Radio receivers used in 1920s.png

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Original file (400 × 970 pixels, file size: 113 KB, MIME type: image/png)

Captions

Captions

Collection of antique 1920s radio receivers

Summary

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Description
English: Pictures of different types of radio receivers used during the 1920s. Unlike today when most radios use a single type of circuit, the superheterodyne, during the 1920s many different circuits were used.
Date
Source Retrieved July 6, 2014 from Radio News magazine, Experimenter Publishing Co., New York, Vol. 7, No. 11, May 1926 p. 1596 from http://www.americanradiohistory.com
Author Unknown authorUnknown author
Permission
(Reusing this file)		 This image is from an advertisement without a copyright notice published in a 1926 US magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.

Licensing

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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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