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经营范围
发明名称
Acoustic apparatus
摘要
申请公布号
US2263233(A)
申请公布日期
1941.11.18
申请号
US19390280941
申请日期
1939.06.24
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TLEGRAPHIE M.B.H.
发明人
BURCK WERNER
分类号
H04R1/40;H04R3/00
主分类号
H04R1/40
代理机构
代理人
主权项
地址
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