Level

Details Level Level

1988-07-06

1991-02-05

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03143503

REFERENCES:
patent: D211754 (1968-07-01), Wullschleger
patent: D257330 (1980-10-01), VanderWerf
patent: D269255 (1983-06-01), Olson
patent: D288539 (1987-03-01), VanderWerf
patent: D308644 (1990-06-01), Butler et al.
patent: 1493164 (1924-05-01), Schade
patent: 3190010 (1965-06-01), Johnson
patent: 3752566 (1973-08-01), Mathews
patent: 4130943 (1978-12-01), Talbot
patent: 4435908 (1984-03-01), Semler, Jr.
patent: 4531301 (1985-07-01), Tau
patent: 4607437 (1986-08-01), McSorley, Sr. et al.

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