US PATENT SUBCLASS 174 / 7
.~ Driving type

Current as of: June, 1999
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174 /   HD   ELECTRICITY: CONDUCTORS AND INSULATORS

6  DF  EARTH GROUNDS {1}
7.~ Driving type

DEFINITION

Classification: 174/7

(under subclass 6) Structures having a portion so formed as to permit it to be readily driven into the earth.