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File:Assortment of Kovar metal.jpg

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Assortment_of_Kovar_metal.jpg(468 × 518 pixels, file size: 54 KB, MIME type: image/jpeg)

Summary

Description
English: An assortment of Kovar metal shapes from an advertisement in an electronics magazine. Kovar is a nickel-cobalt ferrous alloy used to make metal-to-glass seals in vacuum tubes and other scientific vacuum systems because it has the same thermal expansion as glass.

Alterations to image: cropped out ad copy
Date
Source Retrieved November 10, 2015 from Electronics magazine, McGraw-Hill Publishing Co., New York, Vol. 23, No. 7, July 1950, p. 142
Author Unknown
Permission
(Reusing this file)
This image is from an advertisement without a copyright notice published in a 1950 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 1925 and 1977 without a copyright notice. See Commons:Hirtle chart for further explanation. 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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Date/TimeThumbnailDimensionsUserComment
current18:01, 11 November 2015Thumbnail for version as of 18:01, 11 November 2015468 × 518 (54 KB)ChetvornoUser created page with UploadWizard
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