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发明名称
Piston ring
摘要
申请公布号
US2729525(A)
申请公布日期
1956.01.03
申请号
US19520270793
申请日期
1952.02.09
申请人
THOMPSON PRODUCTS, INC.
发明人
SIETMAN HERBERT E.
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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