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发明名称
Bohrverfahren
摘要
申请公布号
DE736435(C)
申请公布日期
1943.06.16
申请号
DE1939K156084D
申请日期
1939.11.28
申请人
FIRMA JOHANN KELLER
发明人
分类号
E21B7/24
主分类号
E21B7/24
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代理人
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