A wood-type golf club head comprises a body having one or more ribs extending across the internal surface of the sole. A seat assembly is removably attached to a stroller base for adjustment between upright and tilted positions. The spring-loaded arms permit the heavy object to be manually pushed downward therebetween, thereby forcing the arms apart enabling the object to fall from the trolley into a container on a packaging table. In this case, when the cooperative information source processing apparatus is notified that a user account with the same authentication information does not exist, the cooperative information source processing apparatus creates a user account based on the authentication information. The toner concentration is determined from the regulated charge voltage.