Abstract: A navigational aid assists a person driving a vehicle in maintaining a desired distance from a reference line. It is particularly useful in navigating agricultural vehicles. The navigational aid includes an upright rail mounted adjacent a window in the cab of the vehicle. A marker is carried by the rail and may be positioned on the line of sight from the driver to the reference line. Driving the vehicle with the marker maintained on the line of sight keeps the vehicle at a constant distance from the reference line. The marker may be an element slidably mounted on the rail.

Abstract: An improved soft tissue implant which resists capsule formation and contracture is described. The implant is coated with a non-immunogenic collagen preparation optionally stabilized by crosslinking.

Abstract: A toy article having a body formed in an egg-like configuration and including a top portion and a base in which a weight is located, the weight insuring that the body will always return to an upright position regardless of exterior forces applied thereto. A central section is disposed between the base and the top portion and is rotatable relative thereto, the central section being divided symmetrically into an opaque portion and a clear portion. Located interiorly of the central section is a fixed interior band having graphic material imprinted thereon that is visible when the clear portion of the central section is aligned therewith, wherein relative movement of the central section with respect to the interior band, locates a selected part of said graphic material in alignment with the clear portion of the central section for visual access thereto.