Ruler

Details Ruler Ruler

1985-05-03

1987-12-08

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D19 35, D19 36, D19 37, D19 38

Patent

active

D02930862

REFERENCES:
patent: D251252 (1979-03-01), Kamila
patent: D253117 (1979-10-01), Knight
patent: D265211 (1982-06-01), Knight
patent: 1009214 (1911-11-01), Backstrom
patent: 1366800 (1921-11-01), Hayden
patent: 2031920 (1936-02-01), Benshimol
patent: 2263637 (1941-11-01), Maupin
patent: 2943392 (1960-07-01), Attridge
patent: 3664025 (1972-05-01), Barto
patent: 3947968 (1976-04-01), Rosenheck

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