US PATENT SUBCLASS 175 / 49
.~ Transparent inspection feature

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

40  DF  WITH SIGNALING, INDICATING, TESTING OR MEASURING {8}
49.~ Transparent inspection feature

DEFINITION

Classification: 175/49

(under subclass 40) Subject matter comprising a step or means for encasing a part of the boring means or cuttings in a transparent enclosure such that said enclosed boring means or cuttings may be visually observed or inspected.