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发明名称
Ribbed-stripper packer unit
摘要
申请公布号
US2583497(A)
申请公布日期
1952.01.22
申请号
US19480040090
申请日期
1948.07.22
申请人
SCHWEITZER FRANK J
发明人
SCHWEITZER FRANK J.
分类号
E21B33/08
主分类号
E21B33/08
代理机构
代理人
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地址
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