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发明名称
MICROPHONE RELAY HEARING APPARATUS
摘要
申请公布号
CA336374(A)
申请公布日期
1933.10.10
申请号
CAD336374
申请日期
申请人
ARMAND VEILLEUX
发明人
ARMAND VEILLEUX
分类号
主分类号
代理机构
代理人
主权项
地址
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