Level

Details Level Level

1988-04-21

1991-02-12

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03145220

REFERENCES:
patent: D180356 (1957-05-01), Brower
patent: D261996 (1981-11-01), Barton
patent: D285780 (1986-09-01), Wright et al.
patent: D308644 (1990-06-01), Butter et al.
patent: 1908518 (1933-05-01), Lee
patent: 3522657 (1970-08-01), Metrulus
patent: 4152838 (1979-05-01), Cook
patent: 4506451 (1985-03-01), Hiltz
patent: 4660292 (1987-04-01), Richardson
patent: 4693011 (1987-09-01), Strayham
patent: 4700489 (1987-10-01), Vasile

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