Lock status indicator

Details Lock status indicator Lock status indicator

1986-03-03

1989-08-22

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

D20 18

Patent

active

D03029530

REFERENCES:
patent: D180144 (1957-04-01), George
patent: D195675 (1963-07-01), Stall
patent: 394140 (1888-12-01), Spicer
patent: 1171287 (1916-02-01), Waschau
patent: 1216899 (1917-02-01), Weyer
patent: 2169743 (1939-08-01), Schlage
patent: 4490999 (1985-01-01), Castle et al.
patent: 4559796 (1985-12-01), De Forrest, Sr.

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