Geometrical instruments – Scriber
Patent
1983-10-26
1985-09-17
Martin, Jr., William D.
Geometrical instruments
Scriber
B43L 1300
Patent
active
045411808
ABSTRACT:
A drawing tool comprises a pair of light transmitting screens, a ground beneath each screen, and a former or tip under each screen adapted to either add material to the ground or subtract material from the ground to create a design thereon. The designs are viewed as a composite three-dimensional image and can be permanently fixed on a removable plate.
REFERENCES:
patent: 2561436 (1951-07-01), Bachmann
patent: 3055113 (1962-09-01), Grandjean
patent: 3468032 (1969-09-01), Smith
patent: 3760505 (1973-09-01), Clark
patent: 4135303 (1979-01-01), Gresset
patent: 4251920 (1981-02-01), Cassagnes
patent: 4343091 (1982-08-01), Stephens
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