US PATENT SUBCLASS 968 / 840
.~ Using an electromechanical oscillator (subclasses 817 and 844 take precedence) [G04F 8/02]


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968 /   HD   HOROLOGY

837  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTROMECHANICAL MEANS [G04F 8/00] {4}
840.~ Using an electromechanical oscillator (subclasses 817 and 844 take precedence) [G04F 8/02] {2}
841  DD  .~.~> Using a piezoelectric oscillator [G04F 8/04]
842  DD  .~.~> Using a magnetostrictive oscillator [G04F 8/06]