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发明名称
Improvements relating to telephones
摘要
申请公布号
GB425558(A)
申请公布日期
1935.03.18
申请号
GB19330029732
申请日期
1933.10.26
申请人
ALFRED GRAHAM & CO. LIMITED;CYRIL HUGH VAUGHAN
发明人
分类号
H04R1/02
主分类号
H04R1/02
代理机构
代理人
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