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

Item

Abstract

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.

Date

1879-12-31

Decade

1870-1879

Subject

Identifier

MBP021

Folder Set

MBP

Title

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

Microfilm ID

92:141

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University