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Telephone-Transmitter: specification forming part of Letters Patent no.344,514, dated 1886 June 29

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Telephone-Transmitter: specification forming part of Letters Patent no.344,514, dated 1886 June 29

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Summary

Copy 1. Application filed January 7, 1886.
Includes diagram as well as specifications. Witnesses listed as A. Pollok and Philip Mauro.
Patent detailing Berliner's improvements to Telephone-transmitters.

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Date

01/01/1886
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Source

Library of Congress
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Copyright info

Public Domain

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electric apparatus and appliances
electric apparatus and appliances