To provide an electrolyte membrane having high strength even if it is thin in the thickness, excellent dimensional stability even upon absorption of water and a low electrical resistance; a process for producing the electrolyte membrane; and a membrane-electrode assembly for polymer electrolyte fuel cells having a high output and excellent durability, having the electrolyte membrane. Each tray segment has a depending clip that is received in a hub of a bearing for rotatably supporting the tray. The USB peripheral device has a USB interface and a controller, which is operative to execute instructions for sending and receiving messages through the USB interface. If a layer performs a scheduling of data packets for the transmission, a rescheduling is performed alternatively or in addition during a channel access delay. The dielectric housing of the second connector includes a plurality of mating passages in the mating face thereof for receiving the mating posts of the first connector. Specifically disclosed is an organic electroluminescent element that has a positive electrode and a negative electrode on a supporting substrate, while comprising an organic layer, which contains at least one light-emitting layer, between the positive electrode and the negative electrode.