Geometrical instruments – Indicator of direction of force traversing natural media – Attaching means
Patent
1979-01-29
1980-06-24
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Attaching means
33371, G01C 928
Patent
active
042088020
ABSTRACT:
A mounting plate is attached to a picture frame and holds a removable liquid bubble level. The plate can be sheared by pushing the frame toward the wall. A card is provided for packaging several mounting plates with a single bubble level.
REFERENCES:
patent: 3422544 (1969-01-01), Wyse
patent: 3766657 (1973-10-01), Hopkins
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