US PATENT SUBCLASS 254 / 232
.~.~ Plural screws


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

199  DF  PORTABLE IMPLEMENTS OR APPARATUS FOR TENSIONING FLEXIBLE MATERIAL OR FOR EXTRACTING STUMPS OR POLES {12}
231  DF  .~ Including screw drive {4}
232.~.~ Plural screws {1}
233  DF  .~.~.~> Having plural, oppositely shifting, threaded riders


DEFINITION

Classification: 254/232

Plural screws:

(under subclass 231) Implements or apparatus including two or more distinct, threaded, cylindrical rods.