Retractable plumb-bob

Details Retractable plumb-bob Retractable plumb-bob

1996-03-15

1997-06-03

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D03795985

REFERENCES:
patent: D359245 (1995-06-01), Lee et al.
patent: 1861692 (1932-06-01), Gerdes
patent: 2523351 (1950-09-01), Armstrong

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