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发明名称
Plug valve casing head
摘要
申请公布号
US2134200(A)
申请公布日期
1938.10.25
申请号
US19350048202
申请日期
1935.11.04
申请人
PIVOTO FELIX L
发明人
PIVOTO FELIX L.
分类号
E21B33/03
主分类号
E21B33/03
代理机构
代理人
主权项
地址
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