January 4, 1918. THE COLLIERY GUARDIAN. 39 HOPKINSON BOILER MOUNTINGS & VALVES TRADE ■K MARK 1918 75 Years Actual Experience in the Design & Manufacture of Valves for all Purposes and Pressures. J. HOPKINSON t CO. L" HUDDERSFIELD. LONDON - GLASGOW - EDINBURGH - PARIS CARDIFF - OLDHAM ■ BLACKPOOL - PETROGRAD No. 399.