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发明名称
Procédé d'amélioration de la longévité des fleurets de perforation et dispositif en permettant la mise en oeuvre
摘要
申请公布号
FR1050970(A)
申请公布日期
1954.01.12
申请号
FRD1050970
申请日期
1952.02.20
申请人
发明人
CHAU ALEXIS-JEAN-HUBERT LE VAILLANT DE
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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