[MBP021], Patent Issued, Thomas Alva Edison, December 31st, 1879
https://edisondigital.rutgers.edu/document/MBP021
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Title
[MBP021], Patent Issued, Thomas Alva Edison, December 31st, 1879
Editor's Notes
British patent 5335 (1879). Improvements in telephones. Electro-chemical telephone; claims use of distilled water in chalk; paladium-tipped rubber; control of primary & tertiary circuits by single key.
Author
Date
1879-12-31
Type
Subject
Folder/Volume ID
MBP-F
Microfilm ID
92:141
Document ID
MBP021
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University