Parallel ruler

Details Parallel ruler Parallel ruler

1992-12-03

1994-06-07

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03475883

REFERENCES:
patent: D201300 (1965-06-01), Seely, Jr.
patent: D259476 (1981-06-01), Feingold et al.
patent: 4339881 (1982-07-01), Kapp

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