Geometrical instruments – Indicator of direction of force traversing natural media – Attaching means
Patent
1977-12-08
1978-11-28
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Attaching means
33371, 33DIG10, G01C 928
Patent
active
041269446
ABSTRACT:
In abstract a preferred embodiment of the present invention is a disposable spirit level adapted to be removably attached to a switch plate or receptacle cover whereby the same may be easily leveled and aligned during installation. The disposable level of the present invention incorporates a weak cement bond to removably secure the same to the switch plate or receptacle cover until such time as the switch plate or receptacle cover is installed and properly aligned.
REFERENCES:
patent: 3116563 (1964-01-01), Gelbman
patent: 3123918 (1964-03-01), Crabtree
patent: 3126776 (1964-03-01), Whistler et al.
patent: 3279080 (1966-10-01), Stepshinski
patent: 3422544 (1969-01-01), Wyse
patent: 3766657 (1973-10-01), Hopkins
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