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3 stage audio amplifier

3 stage audio amplifier

General Radio Company
accessories for AT&T Telehelper 1600 automatic dialer

accessories for AT&T Telehelper 1600 automatic dialer

American Telephone and Telegraph Company
1984
AT&T Elite 305 streamlined memory phone

AT&T Elite 305 streamlined memory phone

American Telephone and Telegraph Company
1984
AT&T receiver

AT&T receiver

Western Electric Company
1895-1899
AT&T Telehelper 1600 automatic dialer

AT&T Telehelper 1600 automatic dialer

American Telephone and Telegraph Company
1984
Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

General Radio Company
1939
audio oscillator, 600-Hz

audio oscillator, 600-Hz

General Radio Company
1925-1930
beat frequency audio oscillator

beat frequency audio oscillator

General Radio Company
circa 1930
beat-frequency oscillator

beat-frequency oscillator

General Radio Company
circa 1935
beat frequency oscillator

beat frequency oscillator

General Radio Company
circa 1925
box for AT&T Elite 305 streamlined memory phone

box for AT&T Elite 305 streamlined memory phone

American Telephone and Telegraph Company
1984
box for AT&T Telehelper 1600 automatic dialer

box for AT&T Telehelper 1600 automatic dialer

American Telephone and Telegraph Company
1984
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The Collection of Historical Scientific Instruments
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