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发明名称
Змеевиковый бур
摘要
申请公布号
SU25565(A1)
申请公布日期
1932.03.31
申请号
SU19310082065
申请日期
1931.01.19
申请人
KALYAKIN V.A.
发明人
KALYAKIN V.A.
分类号
E21B10/44;E21B49/02
主分类号
E21B10/44
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代理人
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