File:Detail showing liquid transmitter in Bell's U.S. Patent No. 161739 obtained in April, 1875.jpg
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Summary
| Description |
English: The U.S. Patent Office granted Bell a patent in April 1875 for a primitive fax machine using a transmitter using liquid mercury. |
| Date | |
| Source | Library of Congress |
| Author | Alexander Graham Bell |
Licensing
|
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. 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. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:28, 22 November 2014 | | 458 × 365 (15 KB) | Heritager | User created page with UploadWizard |
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Credit:
(see original file).
