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发明名称
Piston ring
摘要
申请公布号
US2220948(A)
申请公布日期
1940.11.12
申请号
US19390249035
申请日期
1939.01.03
申请人
THE PERFECT CIRCLE COMPANY
发明人
PATON ROY W.
分类号
F16J9/06;F16J9/20
主分类号
F16J9/06
代理机构
代理人
主权项
地址
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