Four way corner level

Details Four way corner level Four way corner level

1984-05-29

1987-03-03

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

33382

Patent

active

D02885417

REFERENCES:
patent: D253581 (1979-12-01), VanderWerf
patent: D255504 (1980-06-01), VanderWerf
patent: D257330 (1980-10-01), VanderWerf
patent: D261626 (1981-11-01), VanderWerf
patent: D269663 (1983-07-01), Smith
patent: 1554417 (1925-09-01), Dean
patent: 2906031 (1959-09-01), Rice
patent: 3303569 (1967-02-01), Wyatt
patent: 3545091 (1970-12-01), Sebastiani
patent: 3820249 (1974-06-01), Stone
patent: 3826013 (1974-07-01), Baher

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