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发明名称
WORKING PLATFORM FOR CONSTRUCTING SHAFTS
摘要
申请公布号
PL130452(B1)
申请公布日期
1984.08.31
申请号
PL19810229554
申请日期
1981.02.04
申请人
发明人
分类号
E21D;E21D5/12;(IPC1-7):E21D5/12
主分类号
E21D
代理机构
代理人
主权项
地址
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