Abstract: The present invention provides a communication system for transmitting messages from one or more dispatcher stations to and from one or more stand-alone, two-way pagers via a radio frequency communication channel, namely, the short message service (SMS) of the Global System for Mobile Communications (GSM/GPRS) cellular telephone network. The paging system of the present invention utilizes a communications protocol which allows a dispatcher station and a pager of the paging system to communicate over the GSM/GPRS network in a predetermined manner. When the dispatcher station sends a message to a pager of the present invention, the message may contain steering codes which inform the pager of the manner in which the message is to be treated. For example, if the message is time-critical, the pager is notified by the steering code that a response to the message must be transmitted within a predetermined time integral.

Abstract: A hybrid motorbike is provided which is powered by human muscle power on pedals and supplemented by an electric motor with the current generated by a fuel cell on the motorbike. The rear wheel is connected to a planetary-gear train which allows both the supply of muscle power and power from the electric motor. The planetary gear has a sun wheel driven by the electric motor, and a crown gear driven by muscle power, and a planetary-gear carrier having a power take-off to the drive wheel of the bike. The fuel cell and a battery and controls may be contained in an exchangeable module in the triangular space formed in the frame of the bike between the front wheel and seat. The bike has sensors to determine the speed and load placed on the pedals which is transmitted to a microprocessor programmed to control the electric motor according to the load on the pedals and the speed to be provided the desired assistance to pedaling.