February 14, 1876.
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Zur Geschichte von Philipp Reis und das erste Bell - Telephon - Patent
| UNITED STATES PATENT OFFICE. | ||||||
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| ALEXANDER GRAHAM BELL, OF SALEM, MASSACHUSETTS. | ||||||
| IMPROVEMENT IN TELEGRAPHY. | ||||||
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| Specification
forming part of Letters Patent No. 174,465, dated March 7, 1876;
application filed
February 14, 1876. |
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