US PATENT SUBCLASS 181 / 121
.~.~ Moving weight

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}
121.~.~ Moving weight

DEFINITION

Classification: 181/121

(under subclass 113) Subject matter wherein the seismic waves are generated by utilizing the kinetic energy of a moving inertial mass.