Magnetic card-operated electronic door lock

Details Magnetic card-operated electronic door lock Magnetic card-operated electronic door lock

1984-07-27

1987-03-24

Burke, Wallace R.

Tools and hardware

Locking or closing device

D 8353

Patent

active

D02888998

REFERENCES:
patent: D271374 (1983-11-01), Butts
patent: D275462 (1984-09-01), Beeson et al.
patent: 2772555 (1956-12-01), Smith
patent: 3187528 (1975-06-01), Check
patent: 3836945 (1974-09-01), Kinoshita et al.
patent: 4227388 (1980-10-01), Nigrelli et al.
patent: 4232353 (1980-11-01), Musciatti et al.

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