| 摘要 |
FIELD: fire warning systems used in warning systems of fire detection and actuation of fire extinguishers. SUBSTANCE: fire alarm consists of power supply source, twin cable with insulated cords, electric circuit switches actuated by high temperature, and warning devices. Switches are installed in places of possible occurrence of fires along the cable in any locations. EFFECT: simplified design of fire alarm and its easy installation and high operating reliability. 2 cl, 4 dwg
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