Spirit level

Details Spirit level Spirit level

1978-09-25

1980-08-19

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02564416

REFERENCES:
patent: D59943 (1921-12-01), Watson
patent: D186284 (1959-10-01), Hoeh
patent: D238153 (1975-12-01), Johnson
patent: D239821 (1976-05-01), Muller
patent: 1159522 (1915-11-01), Miller
patent: 2633640 (1953-04-01), Buesko

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