of Leeds. Telephone: 75431 (P.B.X.). Telegraphic Address: "Yorkopper, Leeds". Offices: London, Belfast, Birmingham, Bristol, Cardiff, Coventry, Edinburgh, Glasgow, Ipswich, Liverpool, Manchester, Newcastle, Nottingham.
1909 Company established as successors to The Leeds Copper Works Ltd., founded around 1894.
1912 Exhibitor at the Non-Ferrous Metals Exhibition at the Royal Agricultural Halls.
1914 Copper and brass tube manufacturers. Specialities: "Leespec" copper loco tubes, "Bemal" brass condenser tubes, "Gumal" gun metal tubes. Employees 500. 
1927 See Aberconway for information on the company and its history.
Developed a patent fitting for light gauge copper tubes in which solder was included in the body of the fitting, so that tubes could be joined simply by the application of heat, when the solder flowed between the fitting and the tube by capillary attraction. Demand for these fittings from the domestic water service and heating installers, and for gas and refrigerator work, grew so rapidly that a new mill was built for the manufacture of them in the 1930s.
1937 British Industries Fair Advert for "Yorkshire" Fittings: Copper Tubes and Fittings. Also tubes in copper, brass, aluminium, phosphor-bronze, cupro-nickel, etc., and all non-ferrous alloys. "Yorcalbro" (Aluminium Brass), "Yorcwyte" (White Metal), etc. "Yorkshire" fittings for hot and cold water and heating. Advantages of copper water systems demonstrated. "Yorkshire" Tubes and Fittings - cheaper than lead and competitive with iron. (Building, General Heating and Cooking) 
1937 Manufacturers of non-ferrous tubes.