关于信函干线运输使用信盒的探讨上海市邮政局何之信函分拣机的大量使用，使许多局的信函内部处理作业方式发生了很大的变化，同时对信函质量提出了更高的要求，使得传统的使用邮袋封装信函进行干线运输的方式越来越不适应。为此，下面笔者就使用信盒进行信函的干线运输谈... Discussion on the Use of Letter Boxes for the Transport of Letter Trunks The extensive use of letter sorting machines at Shanghai Post Bureau has greatly changed the way of internal handling of correspondences in many offices and at the same time has placed higher demands on the quality of correspondence so that The traditional way of marshalling letters using pouch packaging is becoming more and more unsuited. To this end, the following letter on the use of letter boxes trunk transport talk about ...