Bearings, as parts of machines; Exhausts for motors and engines; Filters being parts of engines; Filters for cleaning cooling air, for engines; Ignition parts for internal combustion engines, namely, condensers; Injectors for engines; Machine parts, namely, blades; Pistons for engines; Pneumatic air preparation equipment, namely, airline filters, lubricators, and regulators, all being parts of machines; Sparking plugs for internal combustion engines; Starters for motors and engines