Patent classifications
G
PHYSICS
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G04
HOROLOGY
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G04F
TIME-INTERVAL MEASURING
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7/00
Apparatus for measuring unknown time intervals by non-electric means
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G04F7/04
using a mechanical oscillator
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G04F7/08
Watches or clocks with stop devices, e.g. chronograph
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G04F7/089
indicating measured time by other than hands, e.g. numbered bands, drums, discs or sheet
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