A suspension system for a rear wheel of a multi-wheel vehicle comprises a front structural member that is adapted to be coupled to seat and a front fork. If the data center or rack consumes more than a threshold amount of power, the data center or rack can be put into power capping mode. The arrangement of coin tubes in a coin tube cassette for use with the coin mechanism can be identified by entering a code on a keypad associated with the coin mechanism. By use of the metal shell, it is possible to improve rigidity of the adaptor, obtain a reliable compatibility, and prevent that the thin, mini-sized memory card is damaged. Information associated with one selected from a plurality of consumer commodities displayed on the displaying portion is extracted and displayed. The locking of the shutter is achieved by a mechanism connected to a bodywork flap such that locking and squashing of a seal are achieved upon the closing of the bodywork flap and the opening of the bodywork flap cannot unlock the shutter without the nozzle additionally being introduced into the system.