US PATENT SUBCLASS 76 / 108.4
.~.~ Well drill

Current as of: June, 1999
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76 /   HD   METAL TOOLS AND IMPLEMENTS, MAKING

101.1  DF  BLANK OR PROCESS {16}
108.1  DF  .~ Drill {3}
108.4.~.~ Well drill

DEFINITION

Classification: 76/108.4

Well drill:

(under subclass 108.1) Invention comprising a stock material for, or method of making a drill intended to penetrate the earth to access fluid therein.