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经营范围
发明名称
Sound generator
摘要
申请公布号
US1815553(A)
申请公布日期
1931.07.21
申请号
US19300486172
申请日期
1930.10.03
申请人
ECKHARDT WALTER L
发明人
ECKHARDT WALTER L.
分类号
G10K9/04
主分类号
G10K9/04
代理机构
代理人
主权项
地址
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