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发明名称
Valve seat ring
摘要
申请公布号
US1993489(A)
申请公布日期
1935.03.05
申请号
US19320641915
申请日期
1932.11.09
申请人
NATIONAL MACHINE PRODUCTS COMPANY
发明人
STOLL ALBERT
分类号
B21K1/24
主分类号
B21K1/24
代理机构
代理人
主权项
地址
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