DE1120256B
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Method and device for the production of folding boxes
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US2944470A
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Method and apparatus for the production of envelopes with gummed closing flaps
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GB893863A
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Improvements in the manufacture of envelopes
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GB792084A
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Manufacture of envelopes
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US2920539A
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Manufacture of envelopes
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Method of and device for making letter envelopes
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GB750922A
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Improvements in or relating to the manufacture of letter envelopes
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DE946277C
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Method and machine for the production of envelopes and flat bags, as well as envelopes, folding bags or the like.
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