Ключевые слова: background, ball, bearing, bearings, built, business, circle, concept, construction, design, detail, document, draft, drafting, drawing, education, engineering, equipment, frame, grease, ideas, industrial, industry, instrument, layout, lines, machine, measure, measurement, mechanical, new, office, paper, pattern, pen, plan, plant, print, project, ruler, scale, science, shape, sketch, tape, technical, technology, tool, work, yellow,