Image:Triple Contact Plug 1907.png
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[edit] Summary
Partial page from 1907 book International Library of Technology: ...Principles of Telephony... International Textbook Company, Scranton, PA; copyright expired.
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This image is in the public domain in the United States. In most cases, this means that it was first published prior to January 1, 1923 (see the template documentation for more cases). Other jurisdictions may have other rules, and this image might not be in the public domain outside the United States. See Wikipedia:Public domain and Wikipedia:Copyrights for more details. |  |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 22:55, 19 June 2007 | 573×719 (296 KB) | Dicklyon (Talk | contribs) | (Partial page from 1907 book ''International Library of Technology: ...Principles of Telephony...'' International Textbook Company, Scranton, PA; copyright expired.) |
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