Connector with selectivity key

Claim 1

IN AN ELECTRICAL CONNECTOR COMPRISING A PLUG MEMBER AND A RECEPTACLE MEMBER, A DEVICE FOR ASSURING CORRECT MUTUAL ORIENTATION OF THE MEMBERS, SAID DEVICE COMPRISING A KEY MOUNTED ON ONE OF SAID MEMBER AND A KEYWAY IN THE OTHER OF SAID MEMBERS, THE KEY AND KEYWAY MATCHING FOR RECEPTION OF THE KEY IN THE KEYWAY WHEN THEY ARE MUTUALLY ORIENTED AND THE MEMBERS ARE IN COUPLING RELATIONSHIP, THE KEYWAY EMBODYING AN OBSTRUCTION TO RECEPTION OF THE KEY WHEN THE KEY AND KEYWAY ARE NOT MUTUALLY ORIENTED, AND MEANS FOR ADJUSTABLY FIXING THE POSITION OF THE KEY AND MEANS FOR ADJUSTABLY FIXING A CORRESPONDING POSITION OF THE KEYWAY TO AFFORD MUTUAL ORIENTATION OF KEY AND KEYWAY IN ONE ONLY PREDETERMINED COMMON POSITION, WHEREBY A PLURALITY OF DIFFERENT POLARIZING COMBINATIONS CAN BE OBTAINED FROM A SINGLE COOPERATING KEY AND KEYWAY, SAID FIRST NAMED MEANS COMPRISING A SOCKET OF EQUILATERAL POLYGONAL SHAPE IN THE FORWARD FACE OF THE ONE MEMBER AND A CIRCULAR COUNTERSINK IN THE REARWARD FACE JOINING THE SOCKET, A KEY HEAD EMBODYING AN EQUILATERAL POLYGONAL SECTION MOUNTED IN THE SOCKET, AND A FLANGE CONTIGUOUS TO THE POLYGONAL SECTION ABUTTING AGAINST SAID FORWARD FACE, A WASHER LODGED IN THE COUNTERSINK AND A SCREW DRAWING THE WASHER AND THE FLANGE INTO CLAMPING RELATIONSHIP AGAINST SAID ONE MEMBER.