US PATENT SUBCLASS 405 / 38
.~ Including subsurface moisture barrier

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

36  DF  DRAINAGE OR IRRIGATION {7}
38.~ Including subsurface moisture barrier

DEFINITION

Classification: 405/38

Including subsurface moisture barrier:

(under subclass 36) Method or apparatus wherein an artificial layer of water impermeable material is provided below the soil surface and is positioned to prevent the passage of water from a region above the layer to a region therebelow.