Implements or apparatus for applying pushing or pulling force – Screw – Geared
Patent
1987-06-05
1988-12-06
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Screw
Geared
B66F 318
Patent
active
047891335
ABSTRACT:
Small sized lifting apparatus which can adjust the lifting rod up or down to an expected point automatically.
REFERENCES:
patent: 2979909 (1961-04-01), Broadbent
patent: 3502301 (1970-03-01), Davis et al.
patent: 3768088 (1973-10-01), Risius
patent: 3888464 (1975-06-01), Felsen
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