Stenographic ruler

Details Stenographic ruler Stenographic ruler

1981-08-17

1984-03-20

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D02730944

REFERENCES:
patent: D60073 (1921-12-01), Turtle
patent: D187387 (1960-03-01), Harley
patent: D212340 (1968-10-01), Hull
patent: D247878 (1978-05-01), Covey
patent: D255784 (1980-07-01), Seely
patent: 2210422 (1940-08-01), Mercer
patent: 2799938 (1957-07-01), Anderson

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