Positional multiplex keyway system

Preassembled cam lock assembly

Profiled key for cylinder locks

Programmable cylinder lock system

Programmable cylinder lock, provided with master keys

Programmable lock apparatus and method

Programmable lock with a controlled programming position

Programmable lock with integral change tooling

Protected cylinder lock

Protecting device for lever handle door locks

Protection device for key lock openings

Protection means for manually operated dead bolt lock

Protective cover for a keyhole of a lock

Protective cover for double-sided type auxiliary locks

Protective device for door knobs and the like

Protective device for the door-lock

Protective doorknob encasement device

Protective lock cylinder mounting assembly

Protective plate for an automobile locking mechanism

Pull-resistant lock core