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经营范围
发明名称
Improvements in or relating to adjustable electro-acoustic transducers
摘要
申请公布号
GB739370(A)
申请公布日期
1955.10.26
申请号
GB19540003111
申请日期
1954.02.02
申请人
JOSEPH FRANCIS KRAUSE
发明人
分类号
G10K11/35
主分类号
G10K11/35
代理机构
代理人
主权项
地址
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