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发明名称
Improvements in devices for maintaining the condition of pianos and the like
摘要
申请公布号
GB630988(A)
申请公布日期
1949.10.25
申请号
GB19470001207
申请日期
1948.01.15
申请人
BEATRICE WHITTAKER
发明人
分类号
G10C9/00
主分类号
G10C9/00
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