| 摘要 |
An apparatus for operation in a tubular channel, the apparatus comprising a first part and a second part connected to the flrst part, wherein the second part comprises a first electronic device adapted to generate a data signal and a first communications device for wirelessly transrnitting the generated data signal via a wireless communications channel, wherein the first part comprises a second communications device for wirelessly receiving the transmifted data signal via said radio-frequency communications channel. |
