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发明名称
Piston rings
摘要
申请公布号
GB491919(A)
申请公布日期
1938.09.09
申请号
GB19370006868
申请日期
1937.03.09
申请人
WILLIAM ARTHUR OUBRIDGE
发明人
分类号
C21D9/40
主分类号
C21D9/40
代理机构
代理人
主权项
地址
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