The Present invention provides an organic EL display and a lighting device having high efficiency. The second portion is adapted for insertion into a passage of an orthodontic appliance, and the resilient connection between the first portion and the second portion releasably secures the coupling in place. The device has means for regulating a gain, which is multiplied to a change acceleration of the steering torque. The dry powder composition can further comprise a hydrophobic agent. A common ink roller is mounted across the feedpath of the web and has a printing surface configured to print an end-of-roll warning stripe in a universal pattern bridging adjacent ribbons irrespective of individual width thereof. A higher value of the two anhysteretic magnetic permeability values in the rolling direction and in the transversal direction is not lower than 18000.