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This chapter contains sections titled: D.S.I.R. and the Research Associations, Explosives and Chemical Engineers, Four New Chemical Pressure Groups, 1916–1922, The Development of Rayon and the Rise of Synthetic Fibres, The Aeroplane, The Rise of Radio, The Genesis of the National Certificate System, The Changed Position of British Industry, 1919–1935, The Rise of the Motor Industry, The Social Impact of the Motor Car, The Problem of the Roads, The Great Combines, New Professional Groups