Call button indicator and wall plate for elevators

Details Call button indicator and wall plate for elevators Call button indicator and wall plate for elevators

1989-05-04

1991-07-30

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

Patent

active

D03186326

REFERENCES:
patent: D121273 (1940-07-01), Davis
patent: D185631 (1959-07-01), Dreyfuss
patent: D186225 (1959-09-01), Sims
patent: D197278 (1964-01-01), Stevenson
patent: 3237591 (1966-03-01), Pichel

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