Ключевые слова: adjust, adjustable, assembling, assembly, base, big, building site, cast, casting, cement, civil engineering, collapsible, concrete, construction, crane, demountable, disassembled, dismantled, durability, durable, frame, hard hat, hardhat, helmet, huge, in parts, industrial, industry, large, mason, masonry, massive, metal, mold, molded, molding, parts, portable, prepare, process, rigger, safety, set up, shape, site, taken apart, under construction, used, work, worker,