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.
Uploaded a work by {{Unknown|author}} from Retrieved 11 May 2024 from [https://www.worldradiohistory.com/Archive-Electronics/30s/Electronics-1934-10.pdf Electronics magazine, McGraw-Hill Co., New York, Vol.7, No.10, October 1934, p.302] without attribution. This publication's copyright would have been renewed in 1962. The [https://onlinebooks.library.upenn.edu/webbin/cinfo/electronics Online Books record of copyright renewals for Electronics] lists no renewals. Therefore it was not renew...
File usage
There are no pages that use this file.
Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
If the file has been modified from its original state, some details may not fully reflect the modified file.