OPENSESAME!

Steel alloys, metal gates, safes, door bells (non-electric), metal locks (other than electric), metal knobs (handles), stretchers for metal bands (tension links), steel pipes, letter boxes (of metal), metal hardware

Electric locks, recorded computer operating programs, chronographs (apparatus for recording elapsed time), horn loudspeakers, presence monitoring apparatus, signal lanterns, aerials, transmitters (telecommunication), electric batteries, optical condensers