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发明名称
Improvements in or relating to telephone receivers
摘要
申请公布号
GB633337(A)
申请公布日期
1949.12.12
申请号
GB19460001852
申请日期
1946.01.18
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
分类号
H04R1/22
主分类号
H04R1/22
代理机构
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