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发明名称
Telephone system
摘要
申请公布号
US1787430(A)
申请公布日期
1931.01.06
申请号
US19280288679
申请日期
1928.06.27
申请人
TELEPHON-APPARAT-FABRIK E. ZWIETUSCH & COMPANY
发明人
APPELIUS FRITZ
分类号
H04Q5/00
主分类号
H04Q5/00
代理机构
代理人
主权项
地址
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