G04F - CPC Classification

• G04F1/00 » Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timer 45
• G04F10/00 » Apparatus for measuring unknown time intervals by electric means 264
• G04F13/00 » Apparatus for measuring unknown time intervals by means not provided for in groups to 31
• G04F3/00 » Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeter with clockwork 16
• G04F5/00 » Apparatus for producing preselected time intervals for use as timing standards 17
• G04F7/00 » Apparatus for measuring unknown time intervals by mechanical means 7
• G04F8/00 » Apparatus for measuring unknown time intervals by electromechanical means 17