Electronic case shift means

Claim 1

AN ELECTRONIC SHIFT AND SHIFT LOCK CIRCUIT OF THE TYPE WHEREIN WHEN THE SHIFT LOCK KEY IS DEPRESSED, THE SHIFT LOCK CIRCUIT REMAINS ENERGIZED UNTIL THE SHIFT KEY IS MOMENTARILY DEPRESSED, SAID CIRCUIT COMPRISING: (A) A SIGNAL GENERATOR FOR ALTERNATIVELY PRODUCING A FIRST ELECTRICAL SIGNAL REPRESENTING LOWER CASE CHARACTERS AND A SECOND ELECTRICAL SIGNAL REPRESENTING UPPER CASE CHRACTERS; (B) FIRST AND SECOND ELECTRICAL CONTACTS EACH MOVABLE BETWEEN FIRST AND SECOND POSITIONS BY SAID SHIFT AND SHIFT LOCK KEYS RESPECTIVELY; AND (C) A GATE-SIGNAL CONTROLLED RECTIFIER FOR COUPLING SAID FIRST AND SECOND CONTACTS TO SAID SIGNAL GENERATOR SUCH THAT SAID FIRST SIGNAL IS PRODUCED WHEN BOTH SAID CONTACTS ARE INS AID FIRST POSITION AND SAID SECOND SIGNAL IS PRODUCED WHEN SAID FIRST CONTACT IS HELD IN SAID SECOND POSITION OR WHEN SAID SECOND CONTACTS IS MOMENTARILY MOVED FROM ITS FIRST TO ITS SECOND POSITION.