Clued letter set

Details Clued letter set Clued letter set

1978-06-07

1980-09-09

Grieb, William H.

35 71, 35 72, G09B 1700

Patent

active

042210615

ABSTRACT:
A set of alphabetical letters in material form for composing words with word pronunciation clued by structural distinctions between members of the set in addition to structural differences denoting alphabetic distinctions.

REFERENCES:
patent: 683267 (1901-09-01), Froehlich
patent: 1732980 (1929-10-01), Mooney
patent: 1752248 (1930-03-01), Fransen
patent: 2586039 (1952-02-01), Heggedal
patent: 3426451 (1969-02-01), Hoffmann
patent: 3715812 (1973-02-01), Novak
patent: 4030211 (1977-06-01), McGinley
patent: 4037846 (1977-07-01), Zeeman

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