Hall location direction panel for elevators

Details Hall location direction panel for elevators Hall location direction panel for elevators

1989-05-08

1991-05-28

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

Patent

active

D03171361

REFERENCES:
patent: D67376 (1925-05-01), Bloem
patent: D254484 (1980-03-01), Perjo
patent: D255105 (1980-05-01), Perjo
patent: D283686 (1986-05-01), Walser
patent: D283687 (1986-05-01), Walser

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