US PATENT SUBCLASS 968 / 844
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTRIC MEANS (timing devices for clocks or watches for comparing the rate of the oscillating member with a standard subclass 769; radar systems, analogous systems G01S 9/00; measuring frequency G01R 23/00; measuring phase angle G01R 25/00) [G04F 10/00]

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968 /   HD   HOROLOGY

844APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTRIC MEANS (timing devices for clocks or watches for comparing the rate of the oscillating member with a standard subclass 769; radar systems, analogous systems G01S 9/00; measuring frequency G01R 23/00; measuring phase angle G01R 25/00) [G04F 10/00] {5}
845  DD  .~> Using oscillators with passive electric resonator, e.g., lumped LC, etc. (subclasses 846, 847, and 849 take precedence) [G04F 10/02]
846  DD  .~> By counting pulses or half cycles of an alternating current [G04F 10/04]
847  DD  .~> By measuring phase [G04F 10/06]
848  DD  .~> Using pulses produced by radioisotopes [G04F 10/08]
849  DD  .~> By measuring electric or magnetic quantities changing in proportion to time [G04F 10/10] {1}