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发明名称
Piano
摘要
申请公布号
US2488196(A)
申请公布日期
1949.11.15
申请号
US19460677703
申请日期
1946.06.19
申请人
JANSSEN WEBSTER E
发明人
JANSSEN WEBSTER E.
分类号
G10C3/16
主分类号
G10C3/16
代理机构
代理人
主权项
地址
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