(under subclass 79) Apparatus in which the means changing the direction of advance has combined therewith means to engage or penetrate a side wall of the hole to resist movement of the direction changing means either longitudinally or radially of the hole.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230, and the search there noted for bore wall or casing engaging anchor.
SEE OR SEARCH CLASS
166, Wells,
117.6, for lateral diverting means for cutting tools per se which are secured in operative position by well conduit engaging means.