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发明名称
Mud screen
摘要
申请公布号
US2408558(A)
申请公布日期
1946.10.01
申请号
US19430514182
申请日期
1943.12.13
申请人
HUTCHISON FRANK E
发明人
HUTCHISON FRANK E.
分类号
E21B21/06
主分类号
E21B21/06
代理机构
代理人
主权项
地址
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