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发明名称
Piano string
摘要
申请公布号
US2746335(A)
申请公布日期
1956.05.22
申请号
US19530343196
申请日期
1953.03.18
申请人
JOHNSON ROBERT E
发明人
JOHNSON ROBERT E.
分类号
B21F17/00;G10D3/10
主分类号
B21F17/00
代理机构
代理人
主权项
地址
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