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经营范围
发明名称
Improvements in or relating to visual indicator for organ having both a manual keyboard and a pedal keyboard
摘要
申请公布号
GB967145(A)
申请公布日期
1964.08.19
申请号
GB19630008276
申请日期
1963.03.01
申请人
ELMER HURD BRIDGES
发明人
分类号
G09B15/00;G10G1/02
主分类号
G09B15/00
代理机构
代理人
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