US PATENT SUBCLASS 181 / 124
.~ Altitude or depth detection

Current as of: June, 1999
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181 /   HD   ACOUSTICS

123  DF  ECHO SYSTEM {1}
124.~ Altitude or depth detection

DEFINITION

Classification: 181/124

(under subclass 123) Subject matter for determining the vertical distance of a body above the surface of the earth or the vertical distance down from a surface.