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发明名称
Perfectionnements aux soupapes de décompression ou de sûreté
摘要
申请公布号
FR1363584(A)
申请公布日期
1964.06.12
申请号
FR19630939790
申请日期
1963.06.28
申请人
DOWTY MINING EQUIPEMENT LIMITED
发明人
分类号
E21D15/51
主分类号
E21D15/51
代理机构
代理人
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