US PATENT SUBCLASS 229 / 920
STRESS RELIEF

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

920STRESS RELIEF

DEFINITION

Classification: 229/920

STRESS RELIEF:

(under the class definition) Subject matter wherein the box includes means for preventing strains from occurring or means for distributing strains to prevent tearing of the box material.