(under subclass 452) Apparatus in which the actuator comprises a winch for winding a cable to hoist the earth working element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
293+, for a plurality of like elements sequentially operated by a power cycle wherein rotary drums are employed to actuate the elements.
414, for apparatus including a vertically adjustable ground support for a tool frame including a flexible connection between the ground support and actuator.
SEE OR SEARCH CLASS
254, Implements or Apparatus for Applying Pushing or Pulling Force,
264+, for apparatus for hauling or hoisting a load including a driven drum which contacts and pulls on a cable attached to the load.
