Portable railroad crossing signal

Details Portable railroad crossing signal Portable railroad crossing signal

1993-08-16

1995-05-02

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D03578810

REFERENCES:
patent: 1463217 (1923-07-01), Kristofek
patent: 1903482 (1933-04-01), Senseney, Jr.
patent: 1952250 (1934-03-01), Hallowell et al.
patent: 2167564 (1939-07-01), Fonda
patent: 2607835 (1952-08-01), Bonar
patent: 3908947 (1975-09-01), Bledsoe, Jr.
patent: 4134222 (1979-01-01), Orsos
patent: 4777750 (1988-10-01), Garfinkle

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