An automatic centrifugal clutch is interposed in a power transmission system between an engine and a driving wheel. The rotation of a first motor out of two motors and is converted into a high-speed low-torque rotational output and transmitted to a ball screw mechanism by a first power transmission mechanism. The fleece laying machine can be formed without its own buffer storage, since the separate buffer storage may also compensate the transport speed fluctuations of the nonwoven web required by the laying movements. A fuel cell system including the preferential oxidation reactor is also disclosed.