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发明名称
VALVE RESEATING DEVICE
摘要
申请公布号
CA309462(A)
申请公布日期
1931.03.17
申请号
CAD309462
申请日期
申请人
CARL A. YERTSON
发明人
CARL A. YERTSON
分类号
主分类号
代理机构
代理人
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