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摘要
申请公布号
SU44847(A1)
申请公布日期
1935.10.31
申请号
SU19340155590
申请日期
1934.10.16
申请人
POLYAKIN I.L.
发明人
POLYAKIN I.L.
分类号
B25B13/50;B25B13/28;E21B19/06
主分类号
B25B13/50
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代理人
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