English: The first zone refining equipment from an advertisement by Bell Telephone Laboratories in an electronics magazine. Zone refining, a technique for purifying materials now widely used in the semiconductor industry, was invented by William Gardner Pfann in 1953. This was the first zone refining tube, with induction heating coiles.
This 1954 issue of Radio and Television News magazine would have the copyright renewed in 1982. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1982 show no renewal entries for Radio and Television News. Therefore the magazine's copyright was not renewed and it is in the public domain.
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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.