US PATENT SUBCLASS 968 / 822
.~ Using oscillators with electromechanical resonators (producing electric oscillations or timing pulses [G04F 5/04]


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968 /   HD   HOROLOGY

817  DD  APPARATUS FOR PRODUCING PRESELECTED TIME INTERVALS FOR USE AS TIMING STANDARDS (generating clock signals for electric digital computers G06F 1/04; regulating frequency in general H03C, L) [G04F 5/00] {6}
822.~ Using oscillators with electromechanical resonators (producing electric oscillations or timing pulses [G04F 5/04] {2}
823  DD  .~.~> Using piezoelectric resonators [G04F 5/06] {1}
826  DD  .~.~> Using magnetostrictive resonators [G04F 5/08]