US PATENT SUBCLASS 968 / 570
.~ By discs (by drums subclass 573) [G04C 17/00S]

Current as of: June, 1999
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968 /   HD   HOROLOGY

564  DD  INDICATING THE TIME OPTICALLY BY ELECTRIC MEANS (subclass 577 takes precedence; by mechanical means subclasses 139 and 162) [G04C 17/00] precedence; by mechanical means subclasses 139 and 162) [G04C 17/00] {6}
570.~ By discs (by drums subclass 573) [G04C 17/00S] {1}
571  DD  .~.~> With date indication [G04C 17/00S2] {1}