US PATENT SUBCLASS 968 / 901
PRODUCING TIMING PULSES (driving circuits for stepping motors subclass 490; producing preselected time intervals for use as timing standards subclass 817; pulse technique in general H03K; control, synchronization, or stabilization of generators in general H03L) [G04G 3/00]

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968 /   HD   HOROLOGY

901PRODUCING TIMING PULSES (driving circuits for stepping motors subclass 490; producing preselected time intervals for use as timing standards subclass 817; pulse technique in general H03K; control, synchronization, or stabilization of generators in general H03L) [G04G 3/00] {1}
902  DD  .~> Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general H03K 23/00 to 29/00) [G04F 3/02] {3}