In one embodiment a method for suppressing narrowband interference in an RF signal is provided. Each veneer specific patching apparatus has two or more patching units. A mathematical algorithm removes step measurement error from the data. The protruding part effectively prevents the chain from coming off from the adjacent sprocket by means of contact of the protruding part with the chain. The produced cantilever 106 exhibited high frequency resonance. A power charging apparatus is provided for charging a mobile communication device.