Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1990-03-28
1991-03-05
Cuchlinski, Jr., William A.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33381, 33384, G01C 924, G01C 928
Patent
active
049967770
ABSTRACT:
A snap-in vial cover for retaining a level-indicating vial on the web of a frame includes first and second vial cover members. The vial cover members are substantially identical in construction. A vial is adapted for placement within a pair of oppositely disposed notches formed in an opening provided in the web of the frame. The first and second members are securable to each other for retaining the vial on the web of the frame.
REFERENCES:
patent: 3311990 (1964-06-01), Wright
patent: 3738015 (1973-06-01), De Jong
patent: 4492038 (1985-01-01), Mayes
patent: 4503623 (1985-03-01), Gould, Jr.
patent: 4765061 (1988-08-01), Rawlings et al.
patent: 4860459 (1989-08-01), Dengler
Cuchlinski Jr. William A.
Johnson Level & Tool Mfg. Co. Inc.
Wirthlin Alvin
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