Surveying instrument

Details Surveying instrument Surveying instrument

1990-07-05

1993-02-16

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03332764

REFERENCES:
patent: D252918 (1979-09-01), Kooi
patent: D268910 (1983-05-01), Shipp et al.
patent: D270816 (1983-10-01), Hays, Jr. et al.
patent: 2774275 (1986-12-01), Keller
Keuffel & Esser Co., Automatic Self-leveling level Ni2, Sep. 1955, cover page.

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