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经营范围
发明名称
Piston ring and expander therefor
摘要
申请公布号
US1840935(A)
申请公布日期
1932.01.12
申请号
US19300473556
申请日期
1930.08.07
申请人
CHARLES CURTIS
发明人
CURTIS CHARLES
分类号
F16J9/06
主分类号
F16J9/06
代理机构
代理人
主权项
地址
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