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发明名称
Mud valve
摘要
申请公布号
GB925555(A)
申请公布日期
1963.05.08
申请号
GB19600000259
申请日期
1960.01.04
申请人
DOMER SCARAMUCCI
发明人
分类号
E21B21/10;F16K3/314
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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