Front face of a key plug

Details Front face of a key plug Front face of a key plug

1991-03-29

1992-04-14

Vinson, Brian N.

Tools and hardware

Locking or closing device

Lock, latch or bolt

Patent

active

D03253368

REFERENCES:
patent: D278880 (1985-05-01), Widen
patent: 1782464 (1930-11-01), Falk
patent: 1961586 (1934-06-01), Heyer
patent: 2059129 (1936-10-01), Maxwell et al.
patent: 2202329 (1940-05-01), Braune
patent: 2803959 (1957-08-01), Schlage
patent: 2807158 (1957-09-01), Best
patent: 3605463 (1971-09-01), Epstein
patent: 4114411 (1978-09-01), Schlage
patent: 4275577 (1981-06-01), Castaldo
patent: 4683740 (1987-08-01), Errani
patent: 4723427 (1988-02-01), Oliver
patent: 4787225 (1988-11-01), Hauser
patent: 4899563 (1990-02-01), Martin
Sargent, "Cylinders & Components" catalogue (1980) p. 8.

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