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经营范围
发明名称
Improvements relating to sound recording discs
摘要
申请公布号
GB623197(A)
申请公布日期
1949.05.13
申请号
GB19460021081
申请日期
1946.07.15
申请人
WILLIAM EDWARD LORD
发明人
分类号
C08J7/04
主分类号
C08J7/04
代理机构
代理人
主权项
地址
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