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发明名称
SPARK-SAFE CIRCUIT FOR SIMPLEX LOUDSPEAKING AND SIGNALLING SYSTEM
摘要
申请公布号
PL108858(B1)
申请公布日期
1980.05.31
申请号
PL19770197429
申请日期
1977.04.13
申请人
发明人
分类号
E21F17/18;G08B;(IPC1-7):E21F17/18
主分类号
E21F17/18
代理机构
代理人
主权项
地址
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