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bent green glass U-shaped tube

bent green glass U-shaped tube

Stainforth Antique Shop
1900-1940
bent green glass U-shaped tube

bent green glass U-shaped tube

Department of Physics, Harvard University
1900-1940
bent green glass U-shaped tube

bent green glass U-shaped tube

Stainforth Antique Shop
1900-1940
Phelps single crown receiver (or transmitter)

Phelps single crown receiver (or transmitter)

Societé du Telephone Edison
1879-1880
telephone receiver "POUR LA FRANCE" (mouthpiece?)

telephone receiver "POUR LA FRANCE" (mouthpiece?)

Telephone Bell
circa 1880
model of a single cylinder horizontal mill engine

model of a single cylinder horizontal mill engine

American
circa 1925
Barritt-Serviss celestial planisphere, 40°N

Barritt-Serviss celestial planisphere, 40°N

Leon Barritt
1906
Hertz wave spark oscillator

Hertz wave spark oscillator

Jefferson Physical Laboratory, Harvard University
1890s
Hertz wave spark oscillator

Hertz wave spark oscillator

Jefferson Physical Laboratory, Harvard University
circa 1903
Acme Reproducer Single Free Edge Cone type K-3 loudspeaker

Acme Reproducer Single Free Edge Cone type K-3 loudspeaker

ACME Apparatus Company
1926-1927
Burns Concert model 120 horn loudspeaker

Burns Concert model 120 horn loudspeaker

American Electric Company, Inc.
circa 1925
Cylindrical Transducer part for Magnavox Radio R3-B early horn loudspeaker

Cylindrical Transducer part for Magnavox Radio R3-B early horn loudspeaker

Magnavox Company
1921
/ 755

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