US PATENT SUBCLASS 968 / 575
.~ Combined electro-optical and electromechanical displays [G04C 17/00V]


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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}
575.~ Combined electro-optical and electromechanical displays [G04C 17/00V]