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关于改进铸造工作的联合指示…………………………………………………中央人民政府第一机械工业部中国机器制造工会筹委会53－6－2怎样进一步贯彻“关于改进铸造工作的联合指示”………………第一机械工业部技术司53－10－4
Joint Directive on Improving Foundry Work ....................................................................................................................................................................................................................................................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................................... ....................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................... ....................................................................................................................... ....................................................................................................................................... ....................................................................................................... ....................................................................................................................................................................................................................... ....................................................................................................................................................................................................... ....................................................................................................................................................................................................................................................... ............................................................ Joint Directive on Improving Foundry Work .................. First Ministry of Machinery Industry Division of Technology 53-10-4