US PATENT SUBCLASS 102 / 312
.~.~ Borehole arrangement

Current as of: June, 1999
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102 /   HD   AMMUNITION AND EXPLOSIVES

301  DF  BLASTING {11}
311  DF  .~ Patterned blasting {1}
312.~.~ Borehole arrangement

DEFINITION

Classification: 102/312

Borehole arrangement:

(under subclass 311) Subject matter wherein a blasting charge is in each of several boreholes.