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发明名称
摘要
申请公布号
JPS5885603(U)
申请公布日期
1983.06.10
申请号
JP19810180715U
申请日期
1981.12.04
申请人
发明人
分类号
E01B25/28;(IPC1-7):E01B25/28
主分类号
E01B25/28
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代理人
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