Elevator hall call panel

Details Elevator hall call panel Elevator hall call panel

1984-12-03

1986-05-06

Bullock, B. J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

Patent

active

D02836858

REFERENCES:
patent: D155871 (1949-11-01), Brounn et al.
patent: D254484 (1980-03-01), Perjo
patent: 3952837 (1976-04-01), Rice
patent: 4134107 (1979-01-01), Miller et al.

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