File:Electrical bushing assortment 1954.jpg

Size of this preview: 800 × 269 pixels. Other resolutions: 320 × 108 pixels | 933 × 314 pixels.

Original file ‎(933 × 314 pixels, file size: 25 KB, MIME type: image/jpeg)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

DescriptionElectrical bushing assortment 1954.jpg	English: An assortment of electrical bushings made by the American Lava Corp. in a 1954 advertisement in an electronics magazine. A bushing is a hollow insulator that allows a conductor to pass through a metal wall without making contact. These are made of alumina ceramic (porcelain). They have operating voltages that range from a few hundred to about 10 thousand volts (righthand one).
Date	November 1954
Source	Retrieved November 10, 2015 from Tele-Tech magazine, Caldwell-Clements, Inc., New York, Vol. 13, No. 11, November 1954, p. 47 on http://www.americanradiohistory.com/
Author	Unknown authorUnknown author
Permission (Reusing this file)	This image is from an advertisement without a copyright notice published in a 1954 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

This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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.

العربية ∙ беларуская (тарашкевіца) ∙ čeština ∙ Deutsch ∙ Ελληνικά ∙ English ∙ español ∙ français ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ Nederlands ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ ไทย ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−