No-dog bubble level

Details No-dog bubble level No-dog bubble level

1998-06-22

1999-05-04

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D04091000

REFERENCES:
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patent: 4829676 (1989-05-01), Waldron
patent: 4947556 (1990-08-01), Peil
patent: 5154000 (1992-10-01), Mahoney et al.
patent: 5167075 (1992-12-01), Weldy et al.
patent: 5535523 (1996-07-01), Endris
Spirit Level, Modern Plastics, pp. 122-123, Apr. 1945.

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