Description
Class G04F : TIME-INTERVAL MEASURING
Subclass 1/08: Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timer (time or time-programme switches which automatically terminate their operation after the programme is completed H01H 43/00) by movement or acceleration due to gravity by a body falling a prefixed distance in air or in a viscous material