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发明名称
Piston ring
摘要
申请公布号
US1746248(A)
申请公布日期
1930.02.11
申请号
US19290347018
申请日期
1929.03.14
申请人
FARMER WALTER L
发明人
FARMER WALTER L.
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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