US PATENT SUBCLASS 52 / 302.2
.~ For a grain bin

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

302.1  DF  WALL, CEILING, FLOOR, OR ROOF DESIGNED FOR VENTILATION OR DRAINAGE {5}
302.2.~ For a grain bin

DEFINITION

Classification: 52/302.2

For a grain bin:

(under subclass 302.1) Floor in which the static structure is designed to allow air to circulate around a harvested crop.