| 摘要 |
<p>The continuous assembly of envelopes, is marked by perforations at equal distances along the strip. The edges of the base band are fitted to form a detachable strip which can be used in the location of the paper in high speed printing. Each of the envelopes is arranged so as to form a letter card with a double fold, and a sealing strip. The individual envelopes are separated from the strip by turning off, and the adhesive strips span the joint. Each of the envelopes can be fitted with a fixed transparent window allowing the address written inside the envelope to be viewed from the outside.</p> |
