Kay and Co (Engineers)
Kay and Co of Blackhorse Street, Bolton. (1928)
Kay and Co (Engineers) Ltd. of Bolton Brass Works, Bolton. (1949)
Kay and Co (Engineers) Ltd. of Blackhorse Street, Bolton. (1957)
1958 Private company.
1961 Brassfounders, alloyers and engineers of Blackhorse Street. Manufacturers of Kontite fittings for light gauge copper tubes.[1]