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发明名称
Piston ring
摘要
申请公布号
US2277307(A)
申请公布日期
1942.03.24
申请号
US19390278432
申请日期
1939.06.10
申请人
THOMPSON PRODUCTS, INCORPORATED
发明人
CRAWFORD FREDERICK C.
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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