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发明名称
BAILER DUMP BOTTOM
摘要
申请公布号
US3477758(A)
申请公布日期
1969.11.11
申请号
USD3477758
申请日期
1967.12.27
申请人
DOW CHEM. CO.:THE
发明人
WARREN M. ZINGG
分类号
E21B27/02;(IPC1-7):E21B43/04;E21B23/06
主分类号
E21B27/02
代理机构
代理人
主权项
地址
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