(under subclass 327) Apparatus in which the bit is of the type commonly called "casing shoe", and which is adapted to be positioned on the end of a tubular conduit to facilitate the entry of such conduit into a preformed bore by reaming or cutting any projections on the bore wall by means of cutting edges provided on said shoe.
(1) Note. For classification in this subclass the device
must be specifically described as a casing shoe and not left to inference.
SEE OR SEARCH THIS CLASS, SUBCLASS:
403+, and the search there noted for a bit specifically described for forming a core.
SEE OR SEARCH CLASS
166, Wells, 242.8, for a casing shoe which has no cutting or reaming function.
