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发明名称
Telephone system
摘要
申请公布号
US2282911(A)
申请公布日期
1942.05.12
申请号
US19390264878
申请日期
1939.03.30
申请人
FIDES GESELLSCHAFT FUR DIE VERWALTUNG AND VERWERTUNG VON GEWERBLICHEN SCHUTZRECHTEN MIT BESCHRANKTER HAFTUNG
发明人
TOPFER HERBERT;EHRICKE ERICH
分类号
H04M7/10;H04Q3/00
主分类号
H04M7/10
代理机构
代理人
主权项
地址
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