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经营范围
发明名称
SAFETY VALVE, SEALING RING AND SEAL ASSEMBLY
摘要
申请公布号
US5199494(A)
申请公布日期
1993.04.06
申请号
US19910726312
申请日期
1991.07.05
申请人
OTIS ENGINEERING CORPORATION
发明人
WILLIAMSON, JR., JIMMIE R.
分类号
E21B34/00;E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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