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发明名称
Improvements in and relating to piston rings
摘要
申请公布号
GB381180(A)
申请公布日期
1932.09.29
申请号
GB19310018765
申请日期
1931.06.29
申请人
WILLIAM WUERFEL
发明人
分类号
F16J9/06;F16J9/20
主分类号
F16J9/06
代理机构
代理人
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地址
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