US PATENT SUBCLASS 368 / 122
.~.~.~.~ With null indicator having variable circuit element

Current as of: June, 1999
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368 /   HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES

89  DF  TIME INTERVAL {6}
107  DF  .~ Electrical or electromechanical {3}
113  DF  .~.~ Stop time type {5}
121  DF  .~.~.~ Including time indicating means actuated by voltage or electrical charge {2}
122.~.~.~.~ With null indicator having variable circuit element

DEFINITION

Classification: 368/122

With null indicator having variable circuit element:

(under subclass 121) Subject matter wherein the voltage or electrical charge indicator indicates a state of zero voltage or electrical charge, and variable means is provided to establish said state, the amount of variation of said

variable means providing a measure of the time interval.