Provided is a multicolor display apparatus including a plurality of organic light-emitting devices each including a pair of electrodes of an anode and a cathode; and an organic compound layer interposed between the pair of electrodes and including a light-emitting layer. The chaff and straw spreader includes a pair of horizontally-disposed, outwardly rotating, cleated conveyors that receive straw and chaff discharged from the grain separator and cleaner of the combine. The automatically chargeable mouse includes a mouse case, an electric energy storage element, multiple audio signal receivers, a driving mechanism, and a control unit. The summation for each temperature zone is divided by the whole catalyst volume to determine temperature distribution volume ratio.