Rolling ruler

Details Rolling ruler Rolling ruler

1994-11-15

1996-01-02

Wirthlin, Alvin

Geometrical instruments

Straightedge type

With means for moving straightedge over a surface

33491, 33464, B43L 1302

Patent

active

054797195

ABSTRACT:
The present rolling ruler includes a ruler body having a through hole, a shall having two ends and sleeving thereon the ruler body, and two rollers respectively mounted on the two ends for translating the ruler body. One characteristic of present invention is that different scales are provided on edges of a ruler body.

REFERENCES:
patent: 2252311 (1941-08-01), Ware
patent: 4473228 (1969-10-01), Hortman et al.
patent: 5174036 (1992-12-01), Lin
patent: 5193284 (1993-03-01), Lin

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