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经营范围
发明名称
SAFETY VALVE
摘要
申请公布号
GB8519147(D0)
申请公布日期
1985.09.04
申请号
GB19850019147
申请日期
1985.07.30
申请人
CAMCO LTD
发明人
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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