Implements or apparatus for applying pushing or pulling force – Screw – Special engaging feature
Patent
1990-09-13
1991-09-17
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Screw
Special engaging feature
254133A, B66F 336
Patent
active
050487965
ABSTRACT:
A jack for insertion through a hole in a sheetrock wall for use in repairing such hole with the jack becoming a structural member of such wall.
REFERENCES:
patent: 2762599 (1956-09-01), Faris
patent: 3880394 (1975-04-01), Wisecarver
Bernheim William S.
Watson Robert C.
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