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经营范围
发明名称
TUBING DRAIN VALVE
摘要
申请公布号
GB8513401(D0)
申请公布日期
1985.07.03
申请号
GB19850013401
申请日期
1985.05.28
申请人
SODERBERG RESEARCH & DEVELOPMENT INC
发明人
分类号
E21B34/06
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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