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| Number | Title | Issue Date |
| 5452344 | Communication over power lines The present invention describes an FSK carrier communication systems for transmitting and receiving data on a electric utility line even in the presence of extreme noise. The present invention uses a unique FSK transmit and receive protocol to distinguish... | 09/19/1995 |
| 5381462 | Utility monitor communications systems A utility meter reading and communications system gathers data from utility meters and sends that data to a utility company's central data collection point (host computer) via phone lines. The system places a call on the user's telephone line at a specifi... | 01/10/1995 |
