| 摘要 |
<p>A trolley for trolley-bus and tram consisting of one or two poles(5) connected to a centering device (1-3) and a pneumatic control means (14) that control all of the movements of the poles (5) by a suitable electronic processing unit and a brake system (16) located along an extension of the axis of rotation (4) of the poles(5).</p> |
