Ключевые слова: assembling, black, bolt, builder, building, coated, conditioning, connection, connector, construction, distribution, engineer, engineering, equipment, flowing, gas, handyman, heat, industrial, industry, install, installation, installer, insulation, lattice, maintenance, male, metal, part, person, pipe, pipeline, pipework, piping, plumber, plumbing, polymer, pressure, repairman, steam, steel, technician, technology, tool, tools, tube, tubing, vessel, work, worker,