English: The Television Test Pattern by M. S. Kay. Radio & Television News, January 1949, Volume 41 Number 1. Pages 38-39 and 135-136. Ziff-Davis Publishing.
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This page was scanned by User:Swtpc6800 with an Epson Perfection 1240U in July 2008.
The copyrights for Radio & Television News are held by Poptronix Inc. The copyright holder indicated that the copyrights of pre 1964 issues were not renewed.
The search of the Renewals for Periodicals for 1975, 1976 and 1977 show no renewal entries for Radio & Television News. Ziff-Davis Publishing acquired Radio News in early 1938 and owned the magazine in 1977. Based on searches of the copyright records, Ziff-Davis Publishing did not make it a practice to renew magazine copyrights.
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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