Locking system as well as a token controlled vending machine provided therewith

Claim 1

IN A KEY AND LOCK SYSTEM THE COMBINATION COMPRISING A PLURALITY OF DIFFERENTLY CODED KEY MEMBERS, EACH SAID KEY MEMBER CARRYING A SIGNATURE COMPRISING A PLURALITY OF INDEX ELEMENTS ARRANGED IN TWO EQUINUMERANT GROUPS, ONE OF SAID GROUPS OF INDEX ELEMENTS CONSTITUTING THE PARTICULAR ACCOUNT NUMBER OF THAT KEY MEMBER AND THE OTHER GROUPS OF INDEX ELEMENTS CONSTITUTING A CHECKING NUMBER, THE ACCOUNT AND CHECKING INDEX ELEMENTS OF THE TWO EQUINUMERANT GROUPS OF EACH KEY MEMBER BEING INTERRELATED BY A PREDETERMINED CONVERSION CODE COMMON TO ALL KEY MEMBERS, A LOCK DEVICE COMPRISING NORMALLY ACTIVE LOCKING MEANS, MEANS FOR SENSING SAID KEY MEMBER SIGNATURE, AND MEANS FOR CHECKING ONE OF SAID EQUINUMERANT INDEX ELEMENT GROUPS AGAINST THE OTHE RONE, SAID CHECKING MEANS ONLY UPON ASCERTAING SAID PREDETERMINED CONVERSION CODE RELATIONSHIP BETWEEN SAID TWO INDEX ELEMENT GROUPS INACTIVATING SAID LOCKING MEANS.