Double level

Details Double level Double level

1991-06-03

1993-06-08

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03362558

REFERENCES:
patent: 740742 (1903-10-01), Bush
patent: 1403606 (1922-01-01), Klapproth
patent: 2752692 (1956-07-01), Smith
patent: 2807888 (1957-10-01), Thomas
patent: 2878569 (1959-03-01), Metrolis
patent: 3104477 (1963-09-01), Edwill

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