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1984年1月份美国纽约空气制动机公司访华期间,经美我双方商定,由我方向美方提供GK型三通阀50套,装于纽约公司的200辆列车制动试验台上与美国的ABDW型控制阀进行混编制动试验,以验证两种制动机混编运用的可行性。同年8～10月美方按照双方商定的试验大纲和补充试验项目,完成了全部试验。此间,我方于是年第3季度派出试验见证小组赴美参加了一些试验。
In January 1984, when the United States and New York Air Brake Company visited China, as agreed by the United States and I, we provided 50 sets of GK type three-way valves from the United States to the 200 train brake test stands in the New York Company and the U.S. ABDW-type control valve hybrid brakes test to verify the feasibility of two kinds of brakes mixed use. In the same year from August to October, the United States completed all the tests according to the experimental program and supplementary test items agreed upon by both sides. In the meantime, we sent a trial witness team in the third quarter of this year to the United States to participate in some trials.