A recording head has: a bottom pole layer and a top pole layer that include pole portions; a recording gap layer placed between the pole portions; and a thin-film coil located between the top and bottom pole layers, the coil being insulated from the pole layers. The valve body is collapsible about a longitudinal axis of the passage for delivery of the valve body via a catheter. A light emitting device of the driving support system can display a far side of the display. The functionally graded materials are sintered via a liquid phase sintering technique. In yet another embodiment, the switch from full-to-half is network-driven instead of user-driven. The partial core members are arranged and secured in a ring-shape with predetermined slits between them, and coils are mounted on each of the coil support cores, respectively.