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发明名称
Telephone apparatus
摘要
申请公布号
US2609458(A)
申请公布日期
1952.09.02
申请号
US19500162451
申请日期
1950.05.17
申请人
DANIEL VIGREN STEN;ERNFRID GUSTAFSSON GUSTAF
发明人
VIGREN STEN DANIEL;GUSTAFSSON GUSTAF ERNFRID
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
地址
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