| 摘要 |
<p>PCT No. PCT/GB97/02414 Sec. 371 Date May 24, 1999 Sec. 102(e) Date May 24, 1999 PCT Filed Sep. 8, 1997 PCT Pub. No. WO98/11022 PCT Pub. Date Mar. 19, 1998An electrically operated device (10) for treatment of hardness of water in a pipe or other waterflow guidance or containment, and which includes an aerial (11) capable of being wrapped externally around a pipe (12); a mains-powered generator (13) for forming a waveform of a predetermined pattern and at a radio frequency; an output connection (15) on the generator to which the aerial can be connected to receive the waveform; and means for varying the frequency of the waveform to suit the diameter of pipe with which the device is to be used.</p> |
