US PATENT SUBCLASS 968 / 903
.~.~ The desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses (in general G06F 7/68) [G04G 3/02B]


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968 /   HD   HOROLOGY

901  DD  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] {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}
903.~.~ The desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses (in general G06F 7/68) [G04G 3/02B]