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经营范围
发明名称
Alloy, electron emitter, and method of making same
摘要
申请公布号
US1976295(A)
申请公布日期
1934.10.09
申请号
US19320609773
申请日期
1932.05.06
申请人
GENERAL MOTORS CORPORATION
发明人
RANDOLPH DONALD W.
分类号
C22C19/00
主分类号
C22C19/00
代理机构
代理人
主权项
地址
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