FIELD: manufacture of pipes. SUBSTANCE: members of box-type guide structure include flat and arch-shaped, convex and concave parts or respective wall parts; they are made from thin-sheet materials, such as sheet metal, plastic or the like; they have rounded-off corners in cross section; members of guide structure are formed by means of joints connecting arc-shaped walls, mainly their edges; interconnected members form guide passages. EFFECT: enhanced reliability. 7 cl, 6 dwg
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