File:Electrical Machinery 1917 - knife switch (cropped).jpg

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Description
English: A double-pole single-throw (DPST) knife switch for starting motors. Cropped version of File:Electrical_Machinery_1917_-_knife_switch.jpg
Date
Source File:Electrical_Machinery_1917_-_knife_switch.jpg
Author Croft, Terrell (1917) Electrical Machinery, McGraw-Hill, pp. p117

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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current23:46, 5 September 2013Thumbnail for version as of 23:46, 5 September 2013401 × 620 (130 KB)Jmorgan (WMF) (talk | contribs)User created page with UploadWizard

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