(under subclass 257) Apparatus in which the tool is movable to operative position by moving externally of the shaft in the space between the shaft and the bore wall.
SEE OR SEARCH CLASS
294, Handling: Hand and Hoist-Line Implements,
86.34, for a nominally claimed earth boring means for cutting away earth or rock or a means for removing loose material or metal around a stuck object (e.g., a section of drill pipe) in a borehole combined with means for retrieving the object.
