| 摘要 |
A method of making continuous envelope structure wherein a continuous ply ultimately constituting the backs of a series of envelopes has united thereto a plurality of ply segments, each ply segment ultimately constituting the front and flap of an envelope in the series, and wherein at least a major portion of the flap of each ply segment overlies the front of an adjacent ply segment, and wherein each ply segment and the continuous ply are transversely perforated after assembly.
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