US PATENT SUBCLASS 229 / 919
.~ Reinforced wall

Current as of: June, 1999
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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

915  DF  STACKING FEATURE {5}
919.~ Reinforced wall

DEFINITION

Classification: 229/919

Reinforced wall:

(under subclass 915) Subject matter wherein one or more of the box walls includes a strengthening means to prevent buckling while in a stack.