Card – picture – or sign exhibiting – Photographic transparency viewer – e.g. – x-ray viewer – Hand held slide viewer
Patent
1981-06-17
1984-03-20
Swiatek, Robert P.
Card, picture, or sign exhibiting
Photographic transparency viewer, e.g., x-ray viewer
Hand held slide viewer
40502, 40518, 40525, G03B 100
Patent
active
044372485
ABSTRACT:
A toy television receiver has a light-diffusing screen curved about a small light bulb, approximating a punctiform source of radiation, which transluminates a transparent carrier of positive images such as an endless film strip or a string of slides. The carrier can be manually advanced by being mounted on one or two reels or on a drum rotatable with the aid of a knurled wheel, which projects from the housing of the device, or by being juxtaposed with an externally manipulable pressure roller.
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patent: 3900647 (1975-08-01), Scardilli et al.
patent: 4326351 (1982-04-01), Heywood et al.
Ross Karl F.
Swiatek Robert P.
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