| 摘要 |
A submetering apparatus that includes a power supply unit, an apartment monitoring unit, a main meter monitoring unit, a power failure detection unit, a power failure protection unit, a main processing unit and a memory unit. The apparatus further includes a display unit, a modem unit, a terminal unit, a control switch unit and a memory module unit. These units interact to allow the apparatus to monitor furnace on-time for individual apartment units and to store that data until needed and to calculate appropriate billing statements.
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