An evaluation of an optical system with respect to visual acuity is appropriately performed, with a chromatic aberration of magnification of the optical system being taken into consideration. The requested apparatus management unit checks the presence or absence of a packet addressed to the requester apparatus management unit, and when there is a packet, notifies the requester apparatus management unit of the presence of the, packet via the LAN. In the preferred embodiments of this invention, the mechanical stop or gate is formed of a resilient deformable material, and includes means for engagement of a complimentary recess or slot at the end of the product dispensing rack. The mono sound spreading unit converts the source sound into pseudo-stereo sound and performs sound spreading on the pseudo-stereo sound, if the source sound is determined to be mono. The TBC over-coating is then removed and a smooth and ideal surface contour is produced along the airfoil surface. A lighting assembly is located directly behind the outer canvas element, and is supported by a backlighting box frame.