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经营范围
发明名称
Sound recorder and reproducer
摘要
申请公布号
US2172431(A)
申请公布日期
1939.09.12
申请号
US19360099945
申请日期
1936.09.09
申请人
UNITED ACOUSTIGRAPH CORPORATION
发明人
BENDER MAX
分类号
G11B3/00
主分类号
G11B3/00
代理机构
代理人
主权项
地址
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