Spirit level

Details Spirit level Spirit level

1994-02-04

1995-02-07

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03551342

REFERENCES:
patent: D224663 (1972-08-01), de Jong
patent: D280185 (1985-08-01), Wright
patent: D332226 (1993-01-01), Hutchins et al.
patent: 2789363 (1957-04-01), Miley
patent: 4506450 (1985-03-01), Fleming et al.
patent: 4876798 (1989-10-01), Zimmerman

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