Spirit level having horizontal bubble vial with improved bubble visibility
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United States of America Patent
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Jul 17, 2012
Grant Date -
Jul 7, 2011
app pub date -
Dec 13, 2009
filing date -
Dec 11, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Spirit levels including a horizontal bubble vial with improved bubble visibility for assisting user readability for leveling purposes. The improved bubble visibility is achieved by coloring a bubble's uppermost surface as perceived by a user.
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