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经营范围
发明名称
Electrical signalling devices applicable specially for indicating vacant seats in cinemas, theatres and like places
摘要
申请公布号
GB390886(A)
申请公布日期
1933.04.20
申请号
GB19310033730
申请日期
1931.12.05
申请人
FRANK ANGELL
发明人
分类号
G08B5/22
主分类号
G08B5/22
代理机构
代理人
主权项
地址
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