Low-pressure mercury vapor discharge lamp has a discharge vessel enclosing, in a gastight manner, a discharge space provided with a filling of mercury and an inert gas in a gastight manner. The composition can be extruded into pellets that are clear and colorless. Deflection of the lever arm causes the rotary shaft of the rotary encoder to undergo a predetermined amount of rotation which is indicative of the thickness dimension of the article being conveyed. In one embodiment, the step extends for the full length of the cab of the vehicle, and partially under a load carrying body at the rear of the vehicle. The blower fan comprises a hub associated with an axis of rotation, and the axial fan comprises the hub. For example, the validinvalid page position information may contain relative position information of the valid data in the block.