Electromagnetic door lock

Tools and hardware – Locking or closing device – Lock – latch or bolt

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Patent

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D03450937

REFERENCES:
patent: 4871204 (1989-10-01), Cook et al.
patent: 5016929 (1991-05-01), Frolov
patent: 5033779 (1991-07-01), Geringer et al.
Dynalock Series 3000 Advertisement, Jan. 1990 Doors & Hardware Magazine.
Securitron Magnalock Advertisement, Jan. 1990, Access Control Magazine.

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