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When the phone rings, the AirForce central vacuum system from M.D. Manufacturing turns off with use of its telephone module. The module is a small, plug-in device that installs into the vacuum system using its built-in universal powerline bus (UPB). Short command messages are sent on a home’s power line with this system. The module connects between the telephone line and the phone as if it were an answering machine. M.D. Manufacturing
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