Spirit level

Details Spirit level Spirit level

1989-05-08

1991-10-01

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03203603

REFERENCES:
patent: D168401 (1952-12-01), Harris
patent: D224663 (1972-08-01), deJong
patent: D301553 (1989-06-01), Makofsky et al.
patent: 2634509 (1953-04-01), Roberts
patent: 2813349 (1957-11-01), Harris
patent: 2944144 (1960-07-01), Naylor
patent: 4407075 (1983-10-01), MacDermott et al.
patent: 4876798 (1989-10-01), Zimmerman

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