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aluminum tuning fork, 100 VPS

aluminum tuning fork, 100 VPS

Central Scientific Company
circa 1950
aluminum tuning fork, C

aluminum tuning fork, C

Central Scientific Company
circa 1950
chronographic tuning fork

chronographic tuning fork

Charles Verdin
1889-1893
chronographic tuning fork and mercury interrupter

chronographic tuning fork and mercury interrupter

Rudolph Koenig
circa 1890
electromagnetic synchronizing fork, 60 Hz

electromagnetic synchronizing fork, 60 Hz

Leeds & Northrup Company
1907-1925
electromagnetic tuning fork

electromagnetic tuning fork

The W. M. Welch Scientific Company
1950-1960
electromagnetic tuning fork

electromagnetic tuning fork

Max Kohl A. G.
circa 1895
electromagnetic tuning fork

electromagnetic tuning fork

Spindler & Hoyer
circa 1900
electromagnetic tuning fork

electromagnetic tuning fork

American
1890-1920
electromagnetic tuning fork

electromagnetic tuning fork

American
1890-1920
electromagnetic tuning fork

electromagnetic tuning fork

Rudolph Koenig
circa 1889
electromagnetic tuning fork

electromagnetic tuning fork

Western Electric Company
1915-1920
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The Collection of Historical Scientific Instruments
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