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METHOD OF DRIVING AND LINING ARRANGEMENT FOR MINE HEADINGS AT THEIR COROSSINGSS
申请公布号:
PL150497(B1)
申请号:
PL19860259609
申请日期:
1986.05.19
申请公布日期:
1990.06.30
分类号:
E21D5/08;E21D9/14;(IPC1-7):E21D5/08
主分类号:
E21D5/08
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