Mammatt, White and Kay
of Leeds
formerly Mammatt and White
1911 Messrs Mammatt, White, and Kay, Mining and Civil Engineers, 1, Albion Place, Leeds.[1]
1918 Mammatt, White and Kay, mining and civil engineers, of Leeds.[2]
1952 Mr. George Dixon, a director of the Leeds firm of consulting engineers, Mammatt White and Kay Ltd.[3]