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Clapp-Eastham tuning coil

Clapp-Eastham tuning coil

Clapp-Eastham Company
circa 1914
GR tuning coil

GR tuning coil

General Radio Company
circa 1915
tuning coil

tuning coil

General Radio Company
late 19th-early 20th Century
tuning coil

tuning coil

Cruft Laboratory, Harvard University
ca. 1910-1930
tuning coil

tuning coil

General Radio Company
ca. 1915-1925
tuning coils, set of 8 on stand

tuning coils, set of 8 on stand

American
1910-1930
variable inductance

variable inductance

General Radio Company
ca. 1915-1925
wireless transmitter tuning coil

wireless transmitter tuning coil

American
circa 1913
wireless transmitter tuning coil

wireless transmitter tuning coil

American
circa 1913
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