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Alarming signal transmission system
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Collective alarm signal transmission device
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ALARM SYSTEM
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False-alarm protection circuit
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Glass breakage alarm
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Alarm circuit for securing an item
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Glass breakage detector
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Glass breakage detector - uses piezoelectric break noise sensor coupled to detector circuit with protection against false triggering
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Burglar alarm switch for door or window - has screened reed contacts operated if external magnet is used to influence alarm contacts
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Safety system for conveyor belt or moving staircase - monitors amplitude of light beam directed across protected region
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Solderless connection box for flat multiple core cables - has input and output cutting strips connected by integral conductive tracks
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