A light emitting device is mountable to a vehicle which has a rotary part and a non-rotary part, and includes a light emitting part (60) which is installed to one of the rotary part such as a wheel and the non-rotary part such as a fork, and an LED (51) wh...

A power management system includes a fuel cell based primary power supply (1) and a rechargeable cell based secondary power supply (2) and a charging control circuit (5) arranged between the two power supplies. A controller (7) applies a charging control s...

A hub for a wheel having a buffer mechanism internally of a hub barrel, in which the great shock caused by a difference in level is relieved to enhance the comfort to ride and the durability, and the left and right lateral torsion in the direction of an ax...