Spirit level

Details Spirit level Spirit level

1996-10-29

1998-03-17

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D03921980

REFERENCES:
patent: D318434 (1991-07-01), Wurst
patent: D319029 (1991-08-01), Burt
patent: D356513 (1995-03-01), Burkholder, II

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