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Incandescent Heat Co Ltd. of British Mills, Cornwall Road, Smethwick, Birmingham. Telephone: Smethwick 0875/6/7/8. Telegraphic Address: "Repeat, Birmingham". (1937)
1904 Public company. The company was registered on 27 June, to acquire certain patent rights. 
1908 Demonstration of patent core for furnace developed by Alfred Smallwood, with testimony from several major industrial users of the furnaces as to the economy of fuel achieved.
1927 Advert for furnaces. 
1929 Interest in a new company Continuous Coal Carbonisation Ltd, of Erith, which was using an oven from the company in its trials.
1937 British Industries Fair Advert as part of The Incandescent Furnace Group, as Specialists in Design and Manufacture of all types of Industrial Furnaces and Equipment Incidental Thereto - for metallurgical, general, engineering, ceramic and other industries. (Engineering/Metals/Quarry, Roads and Mining/Transport Section - Stand Nos. D.327, D.226; Ca.709 and Ca.608). 
1937 Industrial furnace manufacturers. 
1939 See Aircraft Industry Suppliers
1940 Advert. Furnace specialists. 
1945 Advert. Furnaces. 
1952 Patent - Improvements in reciprocating ram pumps. 
1957 Patent - An improved hanger or suspension device for use in the heat treatment of crankshafts. 
1961 Furnace engineers, general constructional engineers and ironfounders. 
1967 Wellman Incandescent Natural Gas Systems was formed which could call on other parts of the Wellman Group, specifically Incandescent Heat Co, W. S. O. Furnaces, Brayshaw Furnaces, Controlled Heat and Air, Manchester Furnace Co, Selas Gas and Engineering Co.