File:Klipschorn speaker drawing 1948.png
Klipschorn_speaker_drawing_1948.png (686 × 314 pixels, file size: 31 KB, MIME type: image/png)
English: Drawing of the Klipschorn loudspeaker manufactured by Klipsch Audio Technologies from 1948. The Klipshorn is a high fidelity speaker system whose notable feature was its folded bass horn system, which is open at the back and is designed to use the walls and floor in the corner of a room as part of the horn structure, to achieve better bass response. The speaker is designed to be placed in the corner of the room.
|Source||Retrieved March 30, 2015 from "New Trends in Loud Speakers" in Radio-Electronics magazine, October 1948, p. 31 on http://www.americanradiohistory.com|
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This 1948 issue of Radio-Electronics magazine would have the copyright renewed in 1976. 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 1975, 1976, and 1977 show no renewal entries for Radio-Electronics. Therefore the copyright was not renewed and it is in the public domain.
This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed. Unless its author has been dead for the required period, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macao), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See Commons:Hirtle chart for further explanation.
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