US PATENT SUBCLASS 181 / 117
.~.~.~ Gas

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  DF  .~.~ Explosive {1}
117.~.~.~ Gas {1}
118  DF  .~.~.~.~> Underwater

DEFINITION

Classification: 181/117

(under subclass 116) Subject matter wherein the material is a gas.