Machine tools, earth working machines, motors and engines (not being land vechiles), cranes, crane masts, derrickes, and lifting apparatus, pumps, housings for machinery, steam hammers, rolling mills, schafting, boilers in this class, and parts of all the aforesaid goods and parts of vehicles and of apparatus for locomotion by land, air and water, and of dredgers, all being machinery or parts of machinery and included in this class,