Line square

Details Line square Line square

1990-04-19

1992-11-24

Walsh, Donald P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 64, D10 70, D10 72

Patent

active

D03311996

REFERENCES:
patent: D318629 (1991-07-01), Michelson
patent: 819350 (1906-05-01), Janssen et al.
patent: 2872733 (1959-02-01), Chew
patent: 3216116 (1965-11-01), Peters et al.
patent: 3568322 (1971-03-01), Showers
patent: 4274203 (1981-06-01), Vasile
patent: 4381607 (1983-05-01), Place
patent: 4462167 (1984-07-01), Huat
patent: 4565005 (1986-01-01), Naka

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