Ключевые слова: african, american, architect, block, bridge crane, builder, business, businessman, checking, concrete, construction, contractor, crane, cubic, engineering, estate, factory, foreman, formwork, freight, guarantee, heavy, helmet, housing, industry, job, male, mixer, outdoor, person, pocket, precast, prefabricated, professional, safety, siemens, site, smartphone, standing, strength, structures, taking, transport, transportation, truck, trucking, wall, work, worker, workplace,