A cylinder of a rotary printing machine has a peripheral surface which is divided into at least two segments that are situated adjacent to each other, in an axial direction of the cylinder, by a circumferential groove. Thus, there is provided a vehicular instrument-mounting structure capable of inhibiting collision of a power control device or other vehicle-mounted instrument with another member, and inhibiting damage caused to the power control device or other vehicle-mounted instrument during a vehicle collision. A specific section information control unit selects a sub-carrier designated by the specific section information to allocate data to be transmitted to the own unit. This virtually eliminates the risk of leaks in the water heater due to bulkhead fittings. According to the method, the presence of the caregiver is detected when the caregiver enters the predetermined area near the display. The narrowed portion of the tube decreases the volume and velocity between the arterial and venous side of the patient to prevent damage or intimal hyperplasia on the venous side between dialysis treatments.