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发明名称
Automatic telephone system
摘要
申请公布号
US1800788(A)
申请公布日期
1931.04.14
申请号
US19270241793
申请日期
1927.12.22
申请人
FRIENDLY MILTON S;TRUST COMPANY CENTRAL
发明人
FRIENDLY MILTON S.;COMPANY CENTRAL TRUST
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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