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经营范围
发明名称
Improvements in or relating to electric audible signals
摘要
申请公布号
GB415255(A)
申请公布日期
1934.08.23
申请号
GB19330020768
申请日期
1933.07.24
申请人
ERICSSON TELEPHONES LIMITED;CHARLES WILFRID WILMAN
发明人
分类号
G10K1/26
主分类号
G10K1/26
代理机构
代理人
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地址
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