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发明名称
PIANO ACTION
摘要
申请公布号
CA500186(A)
申请公布日期
1954.02.23
申请号
CAD500186
申请日期
申请人
PRATT READ AND CO.
发明人
LOUIS MESSANT
分类号
主分类号
代理机构
代理人
主权项
地址
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