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发明名称
Packer unit and packing ring for pipe testing apparatus
摘要
申请公布号
US2797758(A)
申请公布日期
1957.07.02
申请号
US19540450302
申请日期
1954.08.17
申请人
SHOWALTER CLAYTON W
发明人
SHOWALTER CLAYTON W.
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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