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Description
English: Image from patent of electrical switch invented by AJ Bowie, 1906. From the original document:

Application filed January 23, 1906. Serial No. 297,433.

To all whom it may concern, Be it known that I, Augustus J. Bowie, Jr., a citizen of the United States, residing in San Francisco city and county, State of California, have invented certain new and useful Improvements in Electrical Switches; and I do hereby declare the following to be and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. This invention relates of electric switches; The object of the invention is to provide a switch which shall be durable and shall promptly and surely destroy arcs formed at a complete and perfect break in the circuit to be interrupted….
Date 1906-01-23, published 1914-09-15
Source https://encrypted.google.com/patents/US1110374
Author Augustus Jesse Bowie / US Patent Office

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Aj_bowie_switch.jpg

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