Interceptor transformer proximity key

Claim 1

A MAGNETIC PROXIMITY KEY COMPRISING A FLAT SPIRAL COIL OF ELECTRICALLY CONDUCTIVE WIRE, A FIRST MAGNETIC WIRE WINDING WOUND UNIFORMLY IN ONE DIRECTION HELICALLY AROUND THE ELECTRICALLY CONDUCTIVE WIRE FROM END TO END THEREOF AND INSULATED ELECTRICALLY FROM THE COIL, A SECOND MAGNETIC WIRE WINDING WOUND UNIFORMALY IN AN OPPOSITE DIRECTION HELICALLY AROUND THE ELECTRICALLY CONDUCTIVE WIRE OF THE COIL AND AROUND THE FIRST MAGNETIC WIRE WINDING, SAID SECOND WINDING BEING ELECTRICALLY INSULATED FROM THE COIL AND FIRST WINDING, EACH TURN OF THE SECOND WINDING INTERSECTING A TURN OF THE FIRST WINDING, SAID COIL AND WINDINGS CONSTITUTING ON INTERCEPTOR TRANSFORMER MAGNETICALLY BALANCED BY THE TWO WINDINGS, SAID COIL AND WINDACROSS INNER AND OUTER ENDS OF SAID SPIRAL COIL TO CONSTITUTE A TUNED RESONANT CIRCUIT WITH SAID COIL, WHEREBY DAMPED MAGNETIC WAVE TRAINS ARRIVING AT SAID CIRCUIT ARE MAGNETICALLY MEMORIZED BY SAID INTERCEPTOR TRANSFORMER DURING A MAJOR PORTION OF EACH WAVE TRAIN, AND MAGNETIC PULSES REPRESENTING THE MEMORIZED WAVE TRAINS ARE RERADIATED MAGNETICALLY FROM SAID INTERCEPTOR TRANSFORMER DURING A PORTION OF EACH INITIAL ONE HALF CYCLE OF EACH SUCCESSIVE WAVE TRAIN, THE RERADIATED MAGNETIC PULSES HAVING A FREQUENCY CORRESPONDING TO THE RESONANT FREQUENCY OF THE TUNED CIRCUIT.