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unknown mechanical telephones

unknown mechanical telephones

American
late 19th-early 20th Century
unknown telephone piece

unknown telephone piece

Harvard University
late 19th-early 20th Century
wooden telephone transmitter/receiver

wooden telephone transmitter/receiver

American
mid 19th-late 19th Century
unknown telephone piece

unknown telephone piece

Harvard University
late 19th-early 20th Century
Phelps single crown receiver (or transmitter)

Phelps single crown receiver (or transmitter)

Societé du Telephone Edison
1879-1880
Phelps duplex receiver/transmitter

Phelps duplex receiver/transmitter

American Speaking Telephone Company
circa 1878
French Bell-type hard rubber receiver

French Bell-type hard rubber receiver

Société Française des Correspondance Téléphonique
1880
telegraph relay with light shutter

telegraph relay with light shutter

American
1905-1910
one pair calibrated leads for standard resistance bridge measurement

one pair calibrated leads for standard resistance bridge measurement

American
early 20th-mid 20th Century
lead

lead

American
early 20th-mid 20th Century
Brown "pony" receiver

Brown "pony" receiver

Robert G. Brown
circa 1880
nickel-plated cup receiver

nickel-plated cup receiver

American
early 20th Century
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