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发明名称
Improvements relating to electromagnetic sounders or ringers for giving audible calling signals
摘要
申请公布号
GB835156(A)
申请公布日期
1960.05.18
申请号
GB19570030694
申请日期
1957.10.01
申请人
SEIMENS EDISON SWAN LIMITED
发明人
BROWN RONALD ERNEST CHARLES
分类号
G10K1/062;G10K9/13
主分类号
G10K1/062
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代理人
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