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发明名称
Well packer
摘要
申请公布号
US2021206(A)
申请公布日期
1935.11.19
申请号
US19340736357
申请日期
1934.07.21
申请人
SPANG FERDINAND J
发明人
SPANG FERDINAND J.
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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