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发明名称
Alloy steel for internal combustion valves or valve elements
摘要
申请公布号
US2142781(A)
申请公布日期
1939.01.03
申请号
US19380235238
申请日期
1938.10.15
申请人
THE MIDVALE COMPANY
发明人
FREVERT HARRY L.;FOLEY FRANCIS B.
分类号
C22C38/42;F01L3/02
主分类号
C22C38/42
代理机构
代理人
主权项
地址
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