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发明名称
Phonograph disk
摘要
申请公布号
US1787484(A)
申请公布日期
1931.01.06
申请号
US19280252058
申请日期
1928.02.04
申请人
HUBERT LAFFON
发明人
LAFFON HUBERT
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
主权项
地址
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