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| Number | Title | Issue Date |
| 5187720 | Synchronous serial communication circuit The synchronous serial communication circuit transmits and receives data, which is added flag patterns for recognizing the coil winding direction at the first and last of data block, by the electromagnetic induction system using a pair of coils. So, the c... | 02/16/1993 |
| 4630284 | Low power line driving digital transmission system A low power line driving transmission apparatus is described in which TDM signals are transmitted between points over a transmission line comprising a pair of conductors and in which the characteristic impedance of the tranmission line and the source impe... | 12/16/1986 |
| 4434324 | Reversal of connections of telegraphic line wires upon detection of unwanted polarity of the loop current The system comprises at least one teleprinter station (1) connected to an exchange (3) by means of a transmission-reception line (2) and comprising a polarity detector (31) for the line circulating current, and a device (30) for reversing the connection o... | 02/28/1984 |
