Abstract: A rail assembly has an elongated upwardly open and elongated metal rail fixed to a car-body support and two confronting and inwardly concave flanges forming transversely inwardly directed faces and an elongated metal rail fixed to a motor-vehicle seat, captured between the flanges, and having two transversely outwardly directed faces generally complementary to and bearing with prestress outwardly on the inwardly directed faces. Respective friction-reducing layers on the faces allow the seat rail to slide smoothly in the body rail.

Abstract: A slide has a pair of identical longitudinally extending and profiled rails each having at least one flange forming two longitudinally extending tracks. The rails are interfitted with the tracks of one rail transversely confronting the tracks of the other rails. Respective longitudinally extending rows of balls engaged in the tracks between the rails.

Abstract: A flight control indicator for an aircraft, intended to supply the engine pressure ratio, includes acquisition and processing units (2, 3) which determine the actual value of the engine pressure ratio and a display unit (4) provided with a dial (6) and with a needle (7) whose position on the dial (6) corresponds to the actual value of the engine pressure ratio. Moreover, the acquisition and processing units (2, 3) determine minimum and maximum values for the engine pressure ratio, and the display unit (4) presents on the dial (6) a circular sector (8) which is delimited by two radii (8A, 8B) whose positions correspond respectively to the minimum and maximum values for the engine pressure ratio.

Abstract: Flight control indicator for an aircraft, intended to supply the engine pressure ratio.

Abstract: A jack for a car includes a support column having a middle region and a lower end. A base is articulated at the lower end of the support column and pivotable about a first transverse axis. A support arm is articulated at the middle region of the support column and pivotable about a second transverse axis extending in a given direction. The support arm has a free end with bearing surfaces having a circular segmental cross section. A spindle drive is actuatable by a hand crank for adjusting the free end in height. A load receiver has an open-top channel extending parallel to the given direction for engaging a structural part of a car to be supporting on a jack from below. The load receiver has a lower surface with a bearing extension in the form of a spherical section. A calotte-shaped bearing shell is at least partly congruent with and disposed between the bearing surfaces and the bearing extension for tiltably supporting the load receiver on the bearing surfaces in the form of a ball-and-socket joint.