US PATENT SUBCLASS 368 / 123
.~.~.~.~ With vacuum-tube voltmeter

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}
123.~.~.~.~ With vacuum-tube voltmeter

DEFINITION

Classification: 368/123

With vacuum-tube voltmeter:

(under subclass 121) Subject matter wherein the means to indicate the voltage or electrical charge is a high-impedance meter including a space discharge device.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

76.11+, especially 123+ for vacuum tube voltmeters, per se.