Level device

Details Level device Level device

1989-06-15

1991-03-19

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03155218

REFERENCES:
patent: D25130 (1896-02-01), Traut
patent: D43191 (1912-10-01), Disston
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patent: D182773 (1958-05-01), Souter
patent: D205413 (1966-08-01), Wullschleger
patent: D211754 (1968-07-01), Wullschleger
patent: D255434 (1980-06-01), Hanson
patent: D256337 (1980-08-01), Derryberry et al.
patent: D261996 (1981-11-01), Barton
patent: 469451 (1892-02-01), Praddex
patent: 1159522 (1915-11-01), Miller
patent: 3302233 (1967-02-01), Sebastiani

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