Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-09-24
1981-12-15
Trafton, David L.
Communications: electrical
Audible indication
Percussion-type sound producer
5403786, 40453, G08B 536
Patent
active
043062261
ABSTRACT:
A visual display in which written, pictorial or combination thereof may be presented for viewing in an appealing manner for any of a variety of purposes, and apparatus for developing changes and/or animation in the display utilizing specially prepared transparent media by which the subject matter is presented and means to control the visual presentation of that subject matter and obtain change and/or animation effects.
REFERENCES:
patent: 3082560 (1963-03-01), Elvestrom
patent: 3636552 (1972-01-01), Orima
patent: 3683525 (1972-08-01), Fukui
patent: 3839714 (1974-10-01), Janning
patent: 3914761 (1975-10-01), Murase et al.
patent: 3918185 (1975-11-01), Hasala
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