Patent classifications
G
PHYSICS
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G04
HOROLOGY
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G04F
TIME-INTERVAL MEASURING
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1/00
Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers
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G04F1/04
by movement or acceleration due to gravity
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G04F1/06
by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock
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