US PATENT SUBCLASS 968 / 566
.~.~ With date indication [G04C 17/00B2]

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}
565  DD  .~ By hands [G04C 17/00B] {1}
566.~.~ With date indication [G04C 17/00B2]