Hall location direction panel for elevators

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Elevator signal or call unit

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D03171370

REFERENCES:
patent: D67376 (1925-05-01), Van Bloem
patent: D254484 (1980-03-01), Peijo
patent: D255105 (1980-05-01), Peijo
The Honeywell Pamphlet, 2-12-75, p. 3, item--Elevators Graphic Display.

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