Ключевые слова: abstract, cable, check, chemistry, circle, coated, conduit, control, depth, dirty, drop, duct, effect, end, equipment, field, hole, industrial, industry, inside, install, journey, laying, light, mess, move, movement, pipe, pipeline, piping, plastic, plumbing, point, pvc, rays, repair, resistance, rib, ribbed, round, sharpening, slide, speed, surface, transportation, tube, tunnel, underground, utilities, view,