Combination level and protractor

Details Combination level and protractor Combination level and protractor

1990-09-06

1993-09-07

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03390764

REFERENCES:
patent: D311341 (1990-10-01), Lewis et al.
patent: D311343 (1990-10-01), Huxley et al.
patent: D312795 (1990-12-01), Fugett
patent: 2810198 (1957-10-01), Wilson
patent: 2852858 (1958-09-01), Coffey
patent: 3522657 (1970-08-01), Metrolis
patent: 4438538 (1984-03-01), Larsen
patent: 4543731 (1985-10-01), Boundy

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