Abstract: Boat slipway for fixed or mobile set-up, comprising a framework, which can hinge around a horizontal shaft at a right angle to the longitudinal direction of the framework, which shaft is supported by mobile or fixed means, the framework having at least one longitudinally telescopic part, which near its end projecting from the framework is provided with apparatus for connecting the framework with at least one floating body which can keep the framework floating on the water and with which the buoyancy can be adjusted to bring the end of the framework under the surface of the water when a boat is launched or taken out of the water.

Abstract: A shock absorber, e.g. for a motor vehicle, comprising a piston which is mobile in a cylinder and, at both sides of the piston, at least one shock absorbing body. The shock absorbing bodies are open at the topside and at the underside, and have the shape of an elliptic or polygonal section. The upper surface has a smaller section than the lower surface. Between the shock absorbing bodies circular metal discs with a central bore are provided. Each disc possesses an erect edge in which the big lower part of a shock absorbing body is enclosed sealingly on the metal disc. The space limited by the cylinder and the shock absorbing bodies with the metal discs is filled with a viscous liquid. Circumferential passageways for the liquid are present between the edges of the metal discs and the cylinder.