Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1988-02-04
1988-11-08
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 926
Patent
active
047825979
ABSTRACT:
A level-indicating device comprises nail-guiding means for tacking the level onto a door or other wooden structure.
REFERENCES:
patent: 378548 (1888-02-01), Hotchkiss
patent: 1153760 (1915-09-01), Butler
patent: 2570430 (1951-10-01), Cramer
patent: 3191864 (1965-06-01), Moses
Haroian Harry N.
Volk Victor F.
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