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发明名称
Telephone system
摘要
申请公布号
US2244906(A)
申请公布日期
1941.06.10
申请号
US19380182987
申请日期
1938.01.03
申请人
TELEPHON-APPARAT FABRIK E. ZWIETUSCH AND CO. G.M.B.H.
发明人
DOHLE HINRICH
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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