Abstract: A display device containing a poster which is provided with an optically transparent window, and an image-presenting device which presents an internal display that can be seen through the window in the poster. A geometrical parameter selected from the position of the internal display relative to the poster, the shape of the internal display, and the size of the internal display is adjusted so that the internal display is in register with the window in the poster being presented.

Abstract: Display panel including several displays each having a surface area of at least 2 m2 and an automatic display changing device adapted to show these displays successively to the public. Each display comprises an optically transparent window (7) which is placed in front of an image display device which displays successive images corresponding to the display shown to the public.

Abstract: The motorcycle comprises a support rigid with the frame of the motorcycle and at least one cleaning device which is mounted on the support to move between a cleaning position in which it is in contact with the ground and withdrawn position. The cleaning device is coupled to a motor by a transmission. The cleaning device is disposed in a case which is mounted on one side of the motorcycle in the immediate vicinity of the footrest on the same side of the motorcycle. The case has a foot bearing surface and is movable between the aforementioned two positions.