US PATENT SUBCLASS 181 / 111
.~.~ Plural sources

Current as of: June, 1999
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181 /   HD   ACOUSTICS

101  DF  GEOPHYSICAL OR SUBSURFACE EXPLORATION {5}
108  DF  .~ Seismic source and detector {4}
111.~.~ Plural sources

DEFINITION

Classification: 181/111

(under subclass 108) Subject matter wherein the means for transmitting seismic waves includes more than one source.