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经营范围
发明名称
Improvements in or relating to telephone hearing aid devices
摘要
申请公布号
GB691272(A)
申请公布日期
1953.05.06
申请号
GB19500027121
申请日期
1950.11.06
申请人
CANADIAN BENAUDI COMPANY LIMITED
发明人
分类号
H04M1/215
主分类号
H04M1/215
代理机构
代理人
主权项
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