Card key system

Claim 1

AN ELECTRICAL LOCKING SYSTEM TO BE OPENED BY THE FLAT SIDE OF A FLAT KEY WHICH COMPRISES, A HOUSING MEANS HAVING AN OPENING AT ONE SIDE FOR RECEIVING A FLAT KEY AND A SECOND OPENING AT ANOTHER SIDE FOR MANIPULATION OF A CODE SYSTEM FOR SAID LOCKING MEANS, A LOCKING CLOSURE FOR SAID SECOND OPENING, ELECTRICAL CIRCUITRY WITHIN SAID HOUSING MEANS FOR ELECTRICAL ASSOCIATION WITH AN OPENING OR CLOSING DEVICE, AND MEANS IN SAID CIRCUITRY COMPRISING A PLURALITY OF CONTACTS ARRANGED IN A SINGLE PLANE WITHIN SAID HOUSING ADJACENT THE OPENING FOR THE FLAT KEY MEANS, CODE SWITCH MEANS WITHIN SAID HOUSING CONNECTED INTO SAID CIRCUITRY, EACH CONDUCTIVELY ASSOCIATED WITH ONE OF SAID CONTACT MEANS AND ADAPTED TO BE SELECTIVELY CONDITIONED FOR INCLUSION IN SAID CIRCUITRY, AND A FLAT KEY MEANS FOR INSERTION INTO THE KEY OPENING OF SAID HOUSING HAVING MEANS ON THE SURFACE THEREOF FOR SELECTIVELY CONNECTING TWO OR MORE OF SAID CONTACT MEANS IN SAID CIRCUITRY THROUGH SAID CODE SWITCH MEANS, SAID CIRCUITRY AND SAID SWITCH MEANS BEING ENTIRELY CONCEALED AND PROTECTED FROM THE FLAT KEY OPENING BY SAID HOUSING.