US PATENT SUBCLASS 73 / FOR 101
.~ Drill depth-rate (73/151.5)

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

Internet Version by PATENTEC © 1999      Terms of Use


73 /   HD   MEASURING AND TESTING

FOR 100  DF  BORE HOLE AND DRILLING STUDY (73/151) {3}
FOR 101.~ Drill depth-rate (73/151.5)

DEFINITION

Classification: 73/FOR.101

Foreign art collection for measuring the rate at which the drill cuts through the formations, or for periodically determining the depth of the cutting tool, so that said rate could be computed.