US PATENT SUBCLASS 968 / 853
.~.~ Using cathode-ray oscilloscopes (circuits for inserting reference time markers for cathode-ray oscilloscopes G01R 13/30B) [G04F 13/02B]

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968 /   HD   HOROLOGY

851  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MEANS NOT PROVIDED FOR IN SUBCLASS 817 TO SUBCLASS 844 [G04F 13/00] {3}
852  DD  .~ Using optical means [G04F 13/02] {2}
853.~.~ Using cathode-ray oscilloscopes (circuits for inserting reference time markers for cathode-ray oscilloscopes G01R 13/30B) [G04F 13/02B]