US PATENT SUBCLASS 405 / 46
.~.~ Earthen bottom

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

36  DF  DRAINAGE OR IRRIGATION {7}
43  DF  .~ Porous or apertured pipe, flume, or tileway {6}
46.~.~ Earthen bottom

DEFINITION

Classification: 405/46

Earthen bottom:

(under subclass 43) Method or apparatus wherein the water-conducting member is in the form of an inverted open channel.