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发明名称
Spuelkopf fuer Erdbohrer
摘要
申请公布号
DE582113(C)
申请公布日期
1933.08.09
申请号
DE1931N032160D
申请日期
1931.06.03
申请人
THE NATIONAL SUPPLY CORPORATION
发明人
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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