Transparent ruler having longitudinally positioned colored area

Details Transparent ruler having longitudinally positioned colored area Transparent ruler having longitudinally positioned colored area

1975-10-10

1977-05-24

Swisher, S. Clement

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33107R, 116114AJ, B42D 1900

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040248313

ABSTRACT:
A transparent ruler formed of synthetic resinous materials having a longitudinal strip of contrasting light transmitting properties which may overlie a line of characters in a group of such lines to facilitate the rapid scanning thereof.

REFERENCES:
patent: 1353279 (1920-09-01), Schulthess
patent: 2585421 (1952-02-01), Dumais
patent: 2841109 (1958-07-01), Marty
patent: 3352487 (1967-11-01), Olson
patent: 3408977 (1968-11-01), Colman
patent: 3719161 (1973-03-01), Wegner
patent: 3739739 (1973-06-01), Brase

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