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William Newzam Nicholson and Son (later Sons) of Newark-on-Trent, Nottinghamshire
1825 Company formed
1876 Exhibitor at the Smithfield Club Show with a vertical engine and boiler mounted on wheels 
1890 June. Royal Agricultural Society’s Disintegrator and Grist Mill Trials. 
1913 Produced a vertical hopper-cooled four-stroke i/c engine marketed as Bull Dog and available in petrol or paraffin forms and rated at 5 bhp.
1937 Agricultural and general engineers and boiler makers, malleable iron and steel founders.