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United States of America Patent
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-
Jan 9, 1990
Grant Date -
N/A
app pub date -
Jul 15, 1988
filing date -
Jul 20, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A see-through calculator or memory device comprises a transparent base, a see-through printed circuit board and a transparent switch panel. Liquid is housed in a cavity in the base, formed by welding to the base a panel above a recess in the base.
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Cited Art Landscape
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