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发明名称
Telephone system
摘要
申请公布号
US2517517(A)
申请公布日期
1950.08.01
申请号
US19480032314
申请日期
1948.06.11
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
WICKS JOHN;GRANDSTAFF OTHO D.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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