US PATENT SUBCLASS 33 / 719
.~.~ Depth indication

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

700  DF  DISTANCE MEASURING {13}
713  DF  .~ Sounding type {6}
719.~.~ Depth indication

DEFINITION

Classification: 33/719

Depth indication:

(under subclass 713) Subject matter having means to measure the distance from the top of a surface to the bottom.