Fiber Bragg writing devices comprising solid state lasers are provided. The interface is a mated joint of given material, typically metallic, joined by a mechanical fastener or fasteners. Between the clutch bell and the transmission input the planetary gear stage is arranged, whose planetary gear cage includes, but is not limited to a spur gear rim that meshes with at least one first spur gear of a rotor shaft of an electrodynamic device. A second mask layer is formed on the first mask layer. The rotary valve comprises sliding members, through which open flow passages, having sliding surfaces slidable to each other and a mechanical seal mechanism for switching the flow passages while sealing fluid by preliminarily pressing the sliding surfaces, wherein the sliding surface of each sliding members is made of hydrophobic material different in hardness from the other. At a point in time when the air pressure inside the air-storage tank has increased to a first set pressure, the supply of fuel to the engine is cut off, thereby stopping the engine and the combustion of fuel.