Railroad highway crossing sign

Details Railroad highway crossing sign Railroad highway crossing sign

1993-04-15

1994-04-12

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

D20 41

Patent

active

D03459330

REFERENCES:
patent: D80832 (1930-04-01), Englehorn
patent: D83037 (1931-01-01), Fisher
patent: D100018 (1936-06-01), Griswold
patent: D116457 (1939-09-01), Bruner
patent: D126137 (1941-03-01), Slawson
patent: D129838 (1941-10-01), McFarland
patent: 3394498 (1968-07-01), Reinitz et al.

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