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发明名称
WELLHEAD CLOSURE APPARATUS
摘要
申请公布号
CA820085(A)
申请公布日期
1969.08.12
申请号
CAD820085
申请日期
申请人
SHELL OIL COMPANY
发明人
RONALD L. GEER;KENNETH W. FOSTER;NICHOLAS B. NEWMAN
分类号
主分类号
代理机构
代理人
主权项
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