发明名称 |
Detection and alarm equipment |
摘要 |
Detection and alarm equipment for detecting the presence of personnel in a potentially hazardous zone (36) comprises an emitting and receiving component (3) for directing a microwave radiation beam (35) to sense the hazardous zone and a failure detecting unit (2) adapted periodically to conduct a checking calibration to at least a part of the equipment circuitry. <IMAGE> |
申请公布号 |
GB2069736(A) |
申请公布日期 |
1981.08.26 |
申请号 |
GB19800005238 |
申请日期 |
1980.02.15 |
申请人 |
COAL INDUSTRY (PATENTS) LTD |
发明人 |
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分类号 |
E21F17/18;F16P3/14;G08B13/24 |
主分类号 |
E21F17/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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