77933126
Feb 10, 2010
Guide-ways primarily of steel that also contain concrete, which allow for travel of individual cars, trains and freight trucks with both magnetic levitation motors and the ability to drive on both roads and the electric guide-way
Metal GoodsGuide-ways primarily of concrete that also contain steel, which allow for travel of individual cars, trains and freight trucks with both magnetic levitation motors and the ability to drive on both roads and the electric guide-way
Nonmetallic Building Materials