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发明名称
摘要
申请公布号
FR1591335(A)
申请公布日期
1970.04.27
申请号
FRD1591335
申请日期
1968.11.07
申请人
发明人
分类号
E02F9/28;E21C35/18
主分类号
E02F9/28
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