US PATENT SUBCLASS 454 / 178
.~.~.~.~ 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}
177  DF  .~.~.~ Horizontal and vertical perforated or slotted ducts {1}
178.~.~.~.~ With air pump

DEFINITION

Classification: 454/178

With air pump:

(under subclass 177) 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:

180, for a horizontal perforated or slotted harvested crop ventilating duct with an air pump.

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