Ключевые слова: bluecollar, building, connection, construction, contractor, diameter, engineering, equipment, excavation, fitting, hard, hat, industrial, industry, infrastructure, inspection, installation, insulation, job, junction, labor, maintenance, man, manual, material, network, occupation, pipe, pipes, plumbing, pressure, project, repair, replacement, safety, site, size, system, tools, valve, welding, work, worker, working,