US PATENT SUBCLASS 968 / 564
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]


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968 /   HD   HOROLOGY

564INDICATING 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}
567  DD  .~> By flaps [G04C 17/00F] {2}
570  DD  .~> By discs (by drums subclass 573) [G04C 17/00S] {1}
573  DD  .~> By drums or drumlike devices [G04C 17/00T] {1}
575  DD  .~> Combined electro-optical and electromechanical displays [G04C 17/00V]
576  DD  .~> By electric lamps [G04C 17/02]