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发明名称
Telephone system
摘要
申请公布号
US2203725(A)
申请公布日期
1940.06.11
申请号
US19380225165
申请日期
1938.08.16
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
GEITGEY IRVIN
分类号
H04M3/60;H04Q3/00
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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