Escalator motion detecting control device

Details Escalator motion detecting control device Escalator motion detecting control device

1991-10-23

1994-01-04

Chin, Kay H.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D34 30

Patent

active

D03429148

REFERENCES:
patent: D319196 (1991-08-01), Hwang
patent: 1438112 (1922-12-01), Hendricks
patent: 1985563 (1934-12-01), FitzGerald
patent: 4499986 (1985-02-01), Tsuboi

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