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Ader "bull ring" receiver

Ader "bull ring" receiver

Louis-Clément Breguet
circa 1881
Ader "bull ring" receiver

Ader "bull ring" receiver

Louis-Clément Breguet
circa 1881
Bell hard rubber receiver/ transmitter

Bell hard rubber receiver/ transmitter

National Bell Telephone Company
1879
Bell hard rubber receiver/ transmitter

Bell hard rubber receiver/ transmitter

National Bell Telephone Company
1879
Bell speaking telephone receiver/ transmitter

Bell speaking telephone receiver/ transmitter

Jefferson Physical Laboratory, Harvard University
circa 1877
Bell speaking telephone receiver/ transmitter

Bell speaking telephone receiver/ transmitter

Jefferson Physical Laboratory, Harvard University
circa 1877
Bell transmitter

Bell transmitter

Western Electric Company
1898
Brown "pony" receiver

Brown "pony" receiver

Robert G. Brown
circa 1880
Dunand's telephone receiver

Dunand's telephone receiver

A. Dunand
circa 1878
Edison subscriber set

Edison subscriber set

Thomas Alva Edison
1879
Ericsson receiver

Ericsson receiver

L. M. Ericsson
circa 1879
Ericsson receiver

Ericsson receiver

L. M. Ericsson
circa 1879
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