Self-masking transparency viewing apparatus
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United States of America Patent
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Apr 6, 1999
Issued Date -
N/A
app pub date -
May 15, 1997
filing date -
Dec 31, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A viewing apparatus for transparencies or the like masks any display areas not covered by transparencies by generating masks without moving parts, and adapts the luminance level of the image under study and of other display areas to the optimal viewing conditions required by the observer.
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