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发明名称
Megaphone for wind instruments
摘要
申请公布号
US2539662(A)
申请公布日期
1951.01.30
申请号
US19490070925
申请日期
1949.01.14
申请人
GILCREASE LEONARD L
发明人
GILCREASE LEONARD L.
分类号
G10D9/00
主分类号
G10D9/00
代理机构
代理人
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地址
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