Abstract: A caterpillar track comprising chain links hinged to one another by bolts, each bolt traversing boreholes of adjacent chain links and being directly supported in the borehole of one chain link while being supported in the other chain link by resilient annular elements made of polymeric material cross-linked with the bolt and frictionally engaging the borehole walls, the improvement comprising supporting the bolt (1) in the boreholes (4) of the other chain link (2) also by at least one rolling bearing (9,16) arranged between adjacent resilient annular elements (5,6).

Abstract: A rolling bearing arrangement for guidance of a gun barrel during longitudinal displacement comprising a gun barrel having at least three circumferential axis-parallel strips projecting radially outward, each strip having two bearing surfaces parallel to each other and to a radial plane, which in turn are associated with directly opposite bearing surfaces extending parallel thereto in a housing surrounding the gun barrel, and a flat cage containing a set of cylindrical rollers arranged between the directly opposite bearing surfaces, the two sets of rollers cooperating with a common strip being under tension by the arrangement, displaceable in a parallel manner, by at least one element carrying a bearing surface.