(under the class definition) Apparatus including a means provided to fit over and protect a cutting edge of a bit or cutter element from being damaged or inflicting damage only while the bit or cutter element is not in use, such means being necessarily removed or destroyed either before or simultaneously with the commencement of boring.
SEE OR SEARCH THIS CLASS, SUBCLASS:
383, for a cutter element having plural cutting edges, one of which is carried in nonuse position on the bit head or cutter support.
