(一)早在70年代,我国信函分拣机械化作业就开始了准备工作:成立了专门的研究机构——邮电部第三研究所;着手研究信函分拣机械化作业的体制、实施方案;研制信函分拣机及其配套设备;根据全国邮政网的组织划分邮区,着手编制全国邮政编码;组织了一次全国性的协作 (I) As early as the 1970s, the preparatory work for the mechanization of sorting letters in our country began: the establishment of a special research institute, the Third Research Institute of the Ministry of Posts and Telecommunications; the study on the system and implementation of the letter sorting mechanization; the development of letters Sorter and its ancillary equipment; according to the postal network of the country divided by postal area, embarked on the preparation of the national zip code; organized a national collaboration