Ruler

Details Ruler Ruler

1992-05-21

1994-04-19

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D19 37

Patent

active

D03461211

REFERENCES:
patent: D187387 (1960-03-01), Harley et al.
patent: D257556 (1980-11-01), Fulton
patent: D285780 (1986-09-01), Wright et al.
patent: 3230628 (1966-01-01), Hite

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