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发明名称
摘要
申请公布号
PL87651(B1)
申请公布日期
1976.07.31
申请号
PL19730165719
申请日期
1973.10.08
申请人
发明人
分类号
B66B7/00;E21D7/02;(IPC1-7):B66B7/00
主分类号
B66B7/00
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