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US2019174241A1
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Systems and methods for monitoring and controlling sound levels
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Hazard detector, test device for hazard detector, hazard monitoring system and method for testing a hazard detector
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Driver circuit, bus master device, fire detections system and burglar alarming system using the driver circuit
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Bus master device for a hazard alarming system and a hazard alarming system using the same
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Visual alarm device
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Bus coupled alarm device
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Bus coupled alarm device
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Alarm device having a local energy storage unit, and bus-based alarm system
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Alarm system
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Method for operating a voice announcement system
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Danger alarm system with two data transmission speeds
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Alarm system and method of operation
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Method for operating a hazard alarm system
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Method and circuit for testing a carbon monoxide sensor
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Method and circuit for monitoring an emergency power accumulator of a hazard alarm system
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gas detector
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Testing the detection lines of a hazard detection system
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Testing the detection lines of a hazard detection system
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Manual danger warning system
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Transmission path - Test method for a hazard alarm system
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