Ключевые слова: blue, blue print, blueprint, blueprints, caliper, calipers, calliper, callipers, construction, draft, drafting, engineer, engineering, engineering tool, exact, exact measurement, final, final draft, gauge, implement, industrial, industrial tool, machinist, machinist tool, machinists tool, measure, measuring device, measuring instrument, metal, metallic, meter, micrometer, millimeters, mm, pierre vernier, precise, precise measurement, precision instrument, print, rule, ruler, screw, slide, tool, vernier, vernier caliper, vernier calipers,