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

1980-05-27

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

D10109, D26 80, D1006, D2605

Patent

active

D02551055

REFERENCES:
patent: 1517133 (1924-11-01), Van Bloem
patent: 1819247 (1931-08-01), Kinnard

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