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发明名称
摘要
申请公布号
JPS5750348(Y2)
申请公布日期
1982.11.04
申请号
JP19750171872U
申请日期
1975.12.22
申请人
发明人
分类号
E04G11/48;E01D21/00;(IPC1-7):E01D21/02
主分类号
E04G11/48
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