Title:
Manufacture of heat sealed bags
United States Patent 2320326

Inventors:
Avery, Ture M.
Publication Date:
05/25/1943
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Assignee:
UNION BAG & PAPER CORP
Primary Class:
493/197
Other Classes:
493/243, 493/202, 493/235, 493/248, 156/289, 156/203
International Classes:
B31B37/00