Level tool

Details Level tool Level tool

1990-09-17

1993-01-12

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03324117

REFERENCES:
patent: D238153 (1975-12-01), Johnson et al.
patent: D268909 (1983-05-01), Doan
patent: D287474 (1986-12-01), Odegard
patent: D308644 (1990-06-01), Bulter et al.
patent: 582517 (1897-05-01), Bellows
patent: 1500710 (1924-07-01), Kelly
patent: 2386833 (1945-10-01), Baldwin
patent: 3832782 (1974-09-01), Johnson et al.
patent: 5020232 (1991-06-01), Whiteford

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