Self return plumb bob

Details Self return plumb bob Self return plumb bob

1992-06-01

1993-11-16

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03413250

REFERENCES:
patent: 3721009 (1973-03-01), Lucich
patent: 3854218 (1974-12-01), Cohen
patent: 4926562 (1990-05-01), Hwu
patent: 5163230 (1992-11-01), Gast

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