US PATENT SUBCLASS 405 / 290
.~.~.~ Jack

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

258  DF  EARTH TREATMENT OR CONTROL {5}
272  DF  .~ Shoring, bracing, or cave-in prevention {6}
288  DF  .~.~ Roof support {5}
290.~.~.~ Jack {1}
291  DF  .~.~.~.~> Mobile {8}

DEFINITION

Classification: 405/290

Jack:

(under subclass 288) Method or apparatus wherein an

extensible, vertical prop supports the overhead.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type, appropriate subclasses for hydraulic actuators in general.

254, Implements or Apparatus for Applying Pushing or Pulling Force, appropriate subclasses for jacks of general utility.