A filter comprises a pad of non-woven fibrous material, the pad having a substantially solid edge of consolidated pad material which has been softened and subsequently hardened. Multiple leads for coupling to the semiconductor chip are formed in each of the mount parts of the lead frame. When the steering gear box has reached a stroke end, and the assist current or the steering torque is smaller than a predetermined threshold value, the overload preventing control is conducted using a threshold value that is less than the predetermined threshold value. Methods of manufacturing such a structural unit, methods of retrofitting an existing mold for manufacturing such a unit and novel and improved structural units are also disclosed. The dual dipole arrangement enables a one-cabinet stereo loudspeaker with a narrow design. The communication circuit includes an activation device to trigger interrogation of the pest sensing circuit with the communication circuit and an indicating device to provide information about the pest sensing circuit determined in response to the interrogation.