Electrical locking arrangement

Claim 1

IN AN ELECTRICAL LOCKING DEVICE COMPRISING, A KEY, A KEYHOLE AND A CONTROL CIRCUIT, SAID CONTROL CIRCUIT CONNECTED TO SAID KEYHOLE AND INCLUDING A BRIDGE-TYPE NETWORK, SAID BRIDGE-TYPE NETWORK INCLUDING ARMS THEREOF WHICH ARE SUPPLIED BY SAID KEY WHEN INSERTED INTO SAID KEYHOLE, SAID KEY HAVING AN ELONGATED HOUSING OF GENERALLY CYLINDRICAL CONFIGURATION WITH AT LEAST ONE TAPERED END, THE SMALLER END OF SAID TAPERED END INCORPORATING A FIRST CONTACT, SAID HOUSING INCORPORATING A SECOND CONTACT, A THIRD CONTACT INCORPORATED INTO THE INTERMEDIATE PORTION OF SAID HOUSING AND BETWEEN SAID FIRST AND SECOND CONTACTS, EACH OF SAID FIRST, SECOND AND THIRD CONTRACTS BEING INSULATED FROM EACH OTHER, A FIRST PRECISION RESISTOR CONNECTED TO SAID FIRST AND SECOND CONTACTS, A SECOND PRECISION RESISTOR CONNECTED TO SAID THIRD AND SECOND CONTACTS, SAID FIRST AND SECOND PRECISION RESISTORS COMPRISING THE ARMS WHICH ARE SUPPLIED TO SAID BRIDGE-TYPE NETWORK.