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Graham or dead-beat escapement model

Graham or dead-beat escapement model

William Mason Stiles (I)
1839-1850
model of a chronometer escapement

model of a chronometer escapement

Parkinson & Frodsham
circa 1820
recoil or anchor escapement model

recoil or anchor escapement model

Simon Willard
1822
verge escapement model

verge escapement model

Richard L. Ketchen
1990
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The Collection of Historical Scientific Instruments
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