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发明名称
Automatic telephone system
摘要
申请公布号
US1811146(A)
申请公布日期
1931.06.23
申请号
US19220538551
申请日期
1922.02.23
申请人
AUTOMATIC ELECTRIC INC.
发明人
RICHARDSON RODNEY G.;NELSON MARTIN L.
分类号
F16K31/26;H04Q3/00;H04Q3/42
主分类号
F16K31/26
代理机构
代理人
主权项
地址
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