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1976年9月25日到29日,由一机(音阝)矿山工程机械局与江西省机械局在江西省南昌市联合组织了 HYZ—250C 牙轮钻机统一图纸工作,参加会议的有设计、制造、使用部门共12个单位、47名代表参加。会议期间,代表们听取了洛阳矿山机械研究所,江西铸锻厂和首钢矿山公司代表由大石河铁矿、江西铸锻厂、洛阳矿山机器厂、沈阳链条厂、洛阳矿山机械研究所组成的试验组分别介绍 HYZ—250C 牙
From September 25, 1976 to September 29, a unified blueprint of the HYZ-250C roller gear drilling rig was jointly organized by Mine Machinery and Machinery Bureau of Jiangxi Provincial Bureau of Machinery and Bureau of Jiangxi Province and Nanchang City of Jiangxi Province. At the meeting, A total of 12 units of manufacturing and using departments, 47 delegates attended. During the meeting, the delegates listened to the experiment of Luoyang Mining Machinery Research Institute, Jiangxi Casting and Forging Plant and Shougang Mining Company represented by Dashihe Iron Mine, Jiangxi Casting and Forging Plant, Luoyang Mining Machinery Factory, Shenyang Chain Factory and Luoyang Mining Machinery Research Institute Group were introduced HYZ-250C teeth