US PATENT SUBCLASS 254 / 233
.~.~.~ Having plural, oppositely shifting, threaded riders

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  DF  .~.~ Plural screws {1}
233.~.~.~ Having plural, oppositely shifting, threaded riders

DEFINITION

Classification: 254/233

Having plural, oppositely shifting, threaded riders:

(under subclass 232) Implements or apparatus wherein at least two threaded riders are moved by the rods and travel in opposite directions.