Geometrical instruments – Indicator of direction of force traversing natural media – With viewing aid
Reexamination Certificate
2005-11-29
2005-11-29
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Indicator of direction of force traversing natural media
With viewing aid
C033S379000
Reexamination Certificate
active
06968626
ABSTRACT:
A bubble level suitable for spaces that are restricted in the vertical dimension has a 45 degree prism attached to the top surface, so that the image of the bubble vial is deflected along a horizontal axis. The prism is optionally rotatable to permit changing the viewing angle in a horizontal plane.
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Anderson Jay H.
Bennett G. Bradley
Petraske Eric
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