In a device with a plurality of holding units, each holding unit has a leading prong and a rear prong resiliently kept closed for holding a box in vertical orientation. When the valve timing is changed, the amount of change in the valve timing is detected so that the fuel control parameter or the ignition timing control parameter is compensated for on the basis of the change amount thus detected. The received data model may be applied to a second instance of the database schema to generate a second data view of the second database schema. Each of the first and second plurality of blocks has a plurality of non-volatile memory bits that are erased together. The present invention provides a magnetizer of a DC motor comprising: a case; a hemispherical permanent magnet provided within the case; a non-magnetic member provided below the hemispherical permanent magnet; and a coil provided to the non-magnetic member.