Calculator ruler

Details Calculator ruler Calculator ruler

2007-12-04

2007-12-04

Davis, Antoine D. (Department: 2915)

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Design Patent

active

29250781

CLAIM:
The ornamental design for a calculator ruler, as shown and described.

REFERENCES:
patent: 373597 (1887-11-01), Mcmicken
patent: 1496485 (1924-06-01), Schmidtke
patent: D260005 (1981-07-01), Sandfield
patent: D378359 (1997-03-01), Stoneberg
patent: D510042 (2005-09-01), Bhavnani

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