| 摘要 |
PROBLEM TO BE SOLVED: To reduce wiring man-hour to reduce costs. SOLUTION: This gas alarm device 2 is provided with a conventional gas alarm function, also includes a network controlling means 6 controlling communication between a gas meter and a center terminal through a telephone line, does not have to separately perform wiring connection an NCU and the gas meter as in the conventional manner and also, can install the NCU indoors as the gas alarm device 2.
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