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发明名称
摘要
申请公布号
JPS53105501(U)
申请公布日期
1978.08.24
申请号
JP19770010226U
申请日期
1977.01.31
申请人
发明人
分类号
E21C35/18;E02F9/28;(IPC1-7):E02F9/28
主分类号
E21C35/18
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