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经营范围
发明名称
Announcing apparatus
摘要
申请公布号
US1921742(A)
申请公布日期
1933.08.08
申请号
US19310576192
申请日期
1931.11.19
申请人
FRANKLIN JOHN L
发明人
FRANKLIN JOHN L.
分类号
G09F25/00
主分类号
G09F25/00
代理机构
代理人
主权项
地址
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