sentences:  British Rail Classes 26, 33, 44 and 45) were outfitted with their electrical equipment.The company also produced an extensive range of electrical measuring instruments including voltmeters, ammeters and current transformers and, for a brief time at the beginning, made spark plugs.During the Second World War, Crompton Parkinson produced large quantities of .303 rifle ammunition at its Guiseley and Doncaster factories.