(under subclass 98) Apparatus in which said means is operated by pressure fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
228, for fluid pressure operated lubricant feed for bit.
247+, for a core receiver removable through a below ground tool shaft by fluid pressure or provided with a pressure fluid operated latch.
250, for a fluid actuated core retaining or severing means.
267+, for a cutter element shifted laterally relative to a bit head below ground by fluid pressure. 271+, for a cutter element shifted relative to a bit head below ground with a latch operated by a fluid pressure.
296+, for fluid operated below ground hammer or impact device.
SEE OR SEARCH CLASS
166, Wells,
120+, and 212 for fluid pressure expansible anchors.
