An inter-network packet transmission method and system in a vertical handover between the two different technology networks is provided. The invention concerns a quick hitch coupler for coupling an accessory to a dipper arm of a back actor such as may be used by an earth working apparatus. The fault detection system senses any of multiple fault conditions and provides a corresponding fault indicator signal, each indicating a corresponding fault condition. The developer manifold and the rinse manifold can be staggered so as to reduce an external width of the nozzle compared to a nominal external width of the nozzle achievable without either intersecting the fluid manifold and the another manifold or staggering the fluid manifold and the another manifold. By this method, impact strength and flame retardancy are recovered or improved. Analog circuitry and digital circuitry are connected to the processing unit.