Reading device

Details Reading device Reading device

1976-04-15

1977-11-01

Grieb, William H.

40352, G09B 1702

Patent

active

040559084

ABSTRACT:
A shutter is slidingly mounted in a frame which exposes a single line of words on a page of printed material. The shutter may be moved from left to right across the exposed line exposing words, syllables or the like sequentially.

REFERENCES:
patent: 1521491 (1924-12-01), Walker
patent: 2116164 (1938-05-01), Taylor et al.
patent: 2565608 (1951-08-01), Hoff
patent: 2745313 (1956-05-01), Taylor
patent: 2758393 (1956-08-01), Levy
patent: 2840926 (1958-07-01), Campbell
patent: 3386191 (1968-06-01), Michel
patent: 3713230 (1973-01-01), Essmann

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