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Acme type Y-1 vacuum tube radio detector

Acme type Y-1 vacuum tube radio detector

ACME Apparatus Company
1920
crystal detector for radio signals

crystal detector for radio signals

American
circa 1905
WE type SCR 55 radio detector

WE type SCR 55 radio detector

Western Electric Company
circa 1918
Wireless Specialty Perikon type 182-A detector

Wireless Specialty Perikon type 182-A detector

Wireless Specialty Apparatus Company
1913
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The Collection of Historical Scientific Instruments
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