US PATENT SUBCLASS 454 / 180
.~.~.~.~ With air pump

Current as of: June, 1999
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454 /   HD   VENTILATION

173  DF  STORAGE AREA FOR PERISHABLES {2}
174  DF  .~ Harvested crop ventilation {2}
175  DF  .~.~ Having perforated or slotted duct contacting crop {4}
179  DF  .~.~.~ Horizontal duct {1}
180.~.~.~.~ With air pump

DEFINITION

Classification: 454/180

With air pump:

(under subclass 179) Subject matter comprising an air moving apparatus which forces the air into or withdraws it from the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

178, for horizontal and vertical perforated or slotted harvested crop ventilating ducts with an air pump.

181, for other perforated or slotted harvested crop ventilating ducts with an air pump.