Rolling ruler

Details Rolling ruler Rolling ruler

1988-11-18

1991-04-02

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03158730

REFERENCES:
patent: D198935 (1964-08-01), Elkins
patent: D261995 (1981-11-01), Kolodge
patent: 306869 (1884-10-01), Scott
Popular Mechanics, 5/1957, "Ruler on Wheels", p. 146.
Popular Mechanics, 3/1959, "Ruler Rolls", p. 107.

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