System consisting of a noncopyable key and a closed cylinder for

System for controlling the use of a plurality of items

System for identifying, carrying and storing keys

System for interlocking objects

System for managing the issuance and return of selected articles

System for obstructing movement of lock pins

System for ornamenting a key

System for preventing the movement of vehicles having air brakes

System for remote operation of a deadbolt lock

System for setting up and controlling a conference circuit

System for the increase of the number of differing locking possi

System for the use of lockers or the like

System of interconnected lock-cylinders

System of locking

System of non-reproducible locking key and cylinder for said key