(under subclass 263) Apparatus in which the laterally movable cutter element is moved laterally by means of a part which is specifically described as being dropped from above ground to an operative position below ground.
(1) Note. Patents are classified in this subclass which specifically describe the part as being a dropped element even though no such recitation is made in the claims provided the part itself is claimed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237, for means movable relative to a tool below ground to stop flow toward the bore bottom comprising a dropped element.
268, for fluid pressure operated lateral shiftable cutter elements including a dropped element.
271, for laterally shiftable cutter elements having a fluid operated latch.
SEE OR SEARCH CLASS 166, Wells,
239, for detent or clutch in well operated by dropped weight.
