US PATENT SUBCLASS 968 / 827
.~ Using electric or electronic resonators (subclass 829 takes precedence) [G04F 5/10]


Current as of: June, 1999
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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}
827.~ Using electric or electronic resonators (subclass 829 takes precedence) [G04F 5/10]