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发明名称
Choke
摘要
申请公布号
US2906283(A)
申请公布日期
1959.09.29
申请号
US19550518145
申请日期
1955.06.27
申请人
CHURCH WALTER L
发明人
CHURCH WALTER L.
分类号
E21B33/03;F16K1/00
主分类号
E21B33/03
代理机构
代理人
主权项
地址
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