Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B31
MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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B31B
MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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70/00
Making flexible containers, e.g. envelopes or bags
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B31B70/81
Forming or attaching accessories, e.g. opening devices, closures or tear strings
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B31B70/8134
Applying strings; Making string-closed bags
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B31B70/8137
the ends of the strings being attached to the side edges of the bags
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