| 摘要 |
<p>The invention provides for a cleaning device (10, 20, 26, 32, 38, 44) for an electrical transducer having an at least part spherical cavity for receipt, in operation, of a roller member therein, wherein the device comprises a body having a surface (12) defining an at least partially curved contour and arranged for receipt and movement within the said cavity, the body having formations (14; 16; 22; 28; 34; 40) in the said surface thereof for cleaning within the cavity when so received and moved.</p> |
