7 Machine tools and goods of metal being parts of machine tools, namely, benches, columns, bolsters, support stands, tables, consoles, bridges of metal, carts and cart supports; motors and engines, except for land vehicles and parts of metal for motors and engines, except for land vehicles, included in this class, namely, blocks, manifolds and crankcases; machine coupling and transmission components, except for land vehicles; compressor frames and heads of metal as parts of machines, motors and engines; casings of metal for pumps included in this class being parts of machines