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发明名称
Improvements in piston rings
摘要
申请公布号
GB341798(A)
申请公布日期
1931.01.22
申请号
GB19300010940
申请日期
1930.04.07
申请人
FRANCIS THOMAS FORD
发明人
分类号
F16J9/20
主分类号
F16J9/20
代理机构
代理人
主权项
地址
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