Barricade warning light testing device

Details Barricade warning light testing device Barricade warning light testing device

1986-04-28

1989-01-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Electrical property

D10 46, D10 78

Patent

active

D02994402

REFERENCES:
patent: D173999 (1955-02-01), Reynolds
patent: D246767 (1977-12-01), Needham
patent: D282246 (1986-01-01), Thomas
patent: D289582 (1987-05-01), Brush
patent: 2229009 (1941-01-01), Berry

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