Manipulation resistive combination lock

Claim 1

IN A COMBINATION LOCK, A CASING, LOCK MEANS WITHIN THE CASING COMPRISING A FENCE, A SERIES OF ROTATABLE TUMBLERS HAVING GATES INTO WHICH SAID FENCE ENTERS UPON ALIGNMENT OF SAID GATES AND SAID FENCE, A CAM NUB UPON ONE OF SAID TUMBLERS, A CAM PLATE ROTATABLY MOUNTED IN SAID CASING, THERE BEING A CAM SLOT IN SAID CAM PLTE, A RECIPROCABLE BOLT, A STUD ON SAID BOLT RECEIVED IN SAID CAM SLOT, AND OPERATING LEVER PIVOTED AT ONE END UPON SAID CAM PLATE, SAID FENCE BEING FIXED TO THE OTHER END OF SAID OPERATING LEVER, A TRIGGER PIVOTED UPON SAID CAM PLATE, A SPRING CONNECTED DIRECTLY TO SAID OTHER END OF THE OPERATING LEVER AND TO SAID TRIGGER FOR HOLDING A PORTION OF THE TRIGGER IN THE PATH OF SAID CAM NUB AND FOR NORMALLY PRESSING SAID FENCE AWAY FROM SAID TUMBLERS, SAID CAM NUB BEING ARRANGED TO ENGAGE THE TRIGGER ONCE DURING EACH REVOLUTION OF SAID ONE TUMBLER FOR MOMENTARILY MOVING SAID FENCE TOWARD SAID TUMBLERS, SAID SPRING IMMEDIATELY PRESSING SAID FENCE AWAY FROM SAID TUMBLERS WHEN SAID TRIGGER IS RELEASED FROM SAID CAM NUB, SAID FENCE BEING MOVABLE INCIDENTAL TO ROTATION OF SAID TUMBLERS AFTER SAID FENCE ENTERS THE GATES THEREOF, WHEREBY SAID MOVEMENT OF THE FENCE OF SAID TUMBLERS ROTATES SAID CAM PLATE TO RETRACT SAID BOLT.