Spirit level

Details Spirit level Spirit level

1996-03-04

1998-01-06

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D03887197

REFERENCES:
patent: 4979310 (1990-12-01), Wright
patent: 5433011 (1995-07-01), Scarborough et al.

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