Abstract: The invention relates to stereo projection systems for displaying stereopaired images on mirror-spherical or parabolic screens and for collectively watching a stereo effect without using stereo spectacles. Said invention makes it possible to continuously dynamically superimpose the projections of the left and right picture frames of a steropair with the user's left and right eyes, respectively. Such impositions are carried out simultaneously and independently for each viewer.

Abstract: The invention relates to devices for transporting goods and people on stairs and flat surfaces and, in particular, to occupied wheelchairs. The transportation device comprises a frame, to which a seat for accommodating an individual is secured from above, and a lifting mechanism. Individual longitudinal horizontal guides are fastened to the front, the back, the left and the right of the frame respectively, each guide having an angular wheel support secured thereon in such a way as to be movable in a longitudinal horizontal direction, and a drive for the longitudinal horizontal movement of the support along the frame in order to adjust the length of the longitudinal base between the axles of a pair of crosspieces.

Abstract: The invention relates to stereo projection systems for displaying stereopaired images on mirror-spherical or parabolic screens and for collectively watching a stereo effect without using stereo spectacles. Said invention makes it possible to continuously dynamically superimpose the projections of the left and right picture frames of a steropair with the user's left and right eyes, respectively. Such impositions are carried out simultaneously and independently for each viewer.

Abstract: The present invention relates to projection systems for displaying visual information in a variety of applications in order to reduce the projection area, the weight and the dimensions thereof. In one embodiment, the projection system for producing an external surface projection on a visualization screen comprises a flat and thin visualization screen for carrying out projection on both sides. Images can be watched on the left side and on the right side of this screen. From the surface of the screen and on the left and right sides thereof, projectors are provided for projecting images simultaneously on both sides of the screen. Light diffusers are provided on both sides of the screen. The projections are converted through the optics of the projectors so as to form reduced-divergence projection beams which are entirely captured by the light diffusers and which are diverted and diffused at wide angles of image observation ranges.