Call button indicator for an elevator

Details Call button indicator for an elevator Call button indicator for an elevator

1989-05-12

1991-03-19

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Elevator signal or call unit

D13171, D 8353

Patent

active

D03155277

REFERENCES:
patent: D60383 (1922-02-01), Steeple
patent: D186890 (1959-12-01), Brounn
patent: D253940 (1980-01-01), Bedel
patent: D297407 (1988-08-01), Yandek et al.
patent: D305019 (1989-12-01), Pena et al.
patent: 1230643 (1917-06-01), Anderson
patent: 2525769 (1950-10-01), Bruns
patent: 4794211 (1988-12-01), Hibbert et al.

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