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发明名称
Packer
摘要
申请公布号
US1926017(A)
申请公布日期
1933.09.05
申请号
US19320620637
申请日期
1932.07.02
申请人
WELLS WALTER T
发明人
WELLS WALTER T.
分类号
E21B33/129
主分类号
E21B33/129
代理机构
代理人
主权项
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