Up and down directional signal for an elevator

Details Up and down directional signal for an elevator Up and down directional signal for an elevator

1978-04-10

1980-03-18

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

D1006

Patent

active

D02544849

REFERENCES:
patent: 1517133 (1924-11-01), Van Bloem
Porter Metal Products Directional Signs Catalog, .COPYRGT.1949, p. 7, Wall Mounted Exit Sign.
Sweets Architectural Catalog File, 1976, Sec. 14.1/HA, p. 12, Elevator Signal.

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