machine elements not for land vehicles, namely, spherical plain bearings and engine rod ends for mechanical engineering, aviation, and motor sports; machine parts not for land vehicles in the nature of spherical plain bearings for mechanical engineering, aviation, and motor sports; machine parts not for land vehicles, namely, hydraulic rod ends, special rod ends, special spherical plain bearings, angle joints, fork heads, angular contact spherical plain bearings, spherical plain thrust bearin...