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发明名称
Piston ring
摘要
申请公布号
US2173190(A)
申请公布日期
1939.09.19
申请号
US19370124028
申请日期
1937.02.04
申请人
WILKENING FREDERICK W
发明人
WILKENING FREDERICK W.
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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