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[MBP021], Patent Issued, Thomas Alva Edison, December 31st, 1879

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: Edison, Thomas Alva
Date: 1879-12-31
Type: Patent Issued
Subject: Telephone
Folder ID: MBP-F
Microfilm ID: 92:141
Document ID: MBP021
URL: https://edisondigital.rutgers.edu/document/MBP021
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Has Version: Archive.org Viewer, Microfilm Series Reel 92