Ruler

Details Ruler Ruler

1989-05-08

1991-07-02

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03178790

REFERENCES:
patent: D277365 (1985-01-01), Sogorka
patent: 1980884 (1934-11-01), Sidney
patent: 2331298 (1943-10-01), Bennett
patent: 3118233 (1964-01-01), Mesa
patent: 4586265 (1986-05-01), Hopkins et al.

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