This is a file from the Wikimedia Commons

File:Assortment of Kovar metal.jpg

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

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


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
Source Retrieved November 10, 2015 from Electronics magazine, McGraw-Hill Publishing Co., New York, Vol. 23, No. 7, July 1950, p. 142
Author Unknown
(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.


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.

беларуская (тарашкевіца)‎ | čeština | Deutsch | Ελληνικά | English | español | français | italiano | 日本語 | македонски | Nederlands | português | русский | sicilianu | slovenščina | ไทย | +/−

Flag of the United States

File history

Click on a date/time to view the file as it appeared at that time.

current18:01, 11 November 2015Thumbnail for version as of 18:01, 11 November 2015468 × 518 (54 KB)ChetvornoUser created page with UploadWizard
The following pages on the English Wikipedia use this file (pages on other projects are not listed):

Global file usage

The following other wikis use this file:

  • Usage on
  • Usage on
  • Usage on