US PATENT SUBCLASS 267 / 125
.~.~.~ For use in well drilling or operating

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


267 /   HD   SPRING DEVICES

113  DF  FLUID {5}
118  DF  .~ Expansible-contractible chamber device {5}
124  DF  .~.~ Piston {4}
125.~.~.~ For use in well drilling or operating

DEFINITION

Classification: 267/125

(under subclass 124) Spring device useful in an environment including apparatus for either (a) erecting access means to a subterranean supply of liquid or (b) extracting liquid from a subterranean supply.