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经营范围
发明名称
Improvements in or relating to projection screens combined with loud speakers
摘要
申请公布号
GB376395(A)
申请公布日期
1932.07.14
申请号
GB19310011559
申请日期
1931.04.18
申请人
THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED;GEORGE SAIL CAMPBELL LUCAS;KENNETH JOHN RALLINGS COCKE
发明人
分类号
G03B21/56
主分类号
G03B21/56
代理机构
代理人
主权项
地址
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