Transparent communication chart

Details Transparent communication chart Transparent communication chart

1979-01-05

1980-05-27

Skogquist, Harland S.

G09B 2100

Patent

active

042043417

ABSTRACT:
A hand held transparent card is imprinted with letters and numbers on a five by eight grid of squares. The numerals, the alphabet, a slash mark and several abbreviated symbols are sequentially imprinted in the center of the said squares.

REFERENCES:
patent: 450615 (1891-04-01), Delany
patent: 1415833 (1922-05-01), Ginsburg
patent: 1716036 (1929-06-01), Dunning
patent: 1801546 (1931-04-01), Enderle
patent: 1962687 (1934-06-01), Hodge
patent: 3670435 (1972-06-01), Steward
patent: 3673711 (1972-07-01), English
patent: 3879859 (1975-04-01), English

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