US PATENT SUBCLASS 181 / 109
.~.~ Aerial

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}
109.~.~ Aerial

DEFINITION

Classification: 181/109

(under subclass 108) Subject matter wherein the means for transmitting or receiving seismic waves is elevated above the surface of the earth.