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经营范围
发明名称
Amplificateur thermionique.
摘要
申请公布号
CH231155(A)
申请公布日期
1944.02.29
申请号
CHD231155
申请日期
1939.07.20
申请人
BELL TELEPHONE MANUFACTURING COMPANY, SOCIETE ANONYME
发明人
BELL TELEPHONE MANUFACTURING COMPANY, SOCIETE ANONYME
分类号
B22D19/00;B29C33/00;B29C43/02;B29C43/18;B29C43/36;B29C70/78;B32B15/08;F02K9/97;H03F3/02
主分类号
B22D19/00
代理机构
代理人
主权项
地址
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