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经营范围
发明名称
Photoelectric sound apparatus
摘要
申请公布号
US2079537(A)
申请公布日期
1937.05.04
申请号
US19340721975
申请日期
1934.04.23
申请人
WEISS HENRY G
发明人
WEISS HENRY G.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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