US PATENT SUBCLASS 449 / 23
.~.~ One-way passage

Current as of: June, 1999
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449 /   HD   BEE CULTURE

3  DF  HIVE {19}
20  DF  .~ Passage {4}
23.~.~ One-way passage

DEFINITION

Classification: 449/23

One-way passage:

(under subclass 20) Structure intended to allow movement of bees in only a single direction.