US PATENT SUBCLASS 254 / 99
.~ Derrick type

Current as of: June, 1999
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254 /   HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE

98  DF  SCREW {4}
99.~ Derrick type

DEFINITION

Classification: 254/99

Derrick type:

(under subclass 98) Screw pushing and pulling implement comprising a derrick structure from which the load is suspended.