Plumb bob

Details Plumb bob Plumb bob

1990-03-19

1993-03-30

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03343480

REFERENCES:
patent: 1571687 (1926-02-01), O'Loughlin
patent: 2637913 (1953-05-01), Williams
patent: 4061291 (1977-12-01), Cunningham
patent: 4565005 (1986-01-01), Naka
patent: 4926562 (1990-05-01), Hwu

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