US PATENT SUBCLASS 181 / 116
.~.~ Explosive

Current as of: June, 1999
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181 /   HD   ACOUSTICS

101  DF  GEOPHYSICAL OR SUBSURFACE EXPLORATION {5}
113  DF  .~ Seismic wave generation {5}
116.~.~ Explosive {1}
117  DF  .~.~.~> Gas {1}

DEFINITION

Classification: 181/116

(under subclass 113) Subject matter wherein the means for producing seismic waves includes means for utilizing the violent expansion of hot gases resulting from the sudden combustion of a material.