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经营范围
发明名称
High pressure safety valve mechanism
摘要
申请公布号
US1840967(A)
申请公布日期
1932.01.12
申请号
US19280275272
申请日期
1928.05.05
申请人
R. L. WAXLER
发明人
MARTIN JOHN R.
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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