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Campbells and Hunter of Dolphin Foundry, Leeds were makers of machine tools.
1897 Various boiler-making machines featured in 'The Engineer', 20th August 1897 (for plate bending, boiler end finishing, and a combined circular planing/slotting/drilling machine)
1911 Heavy duty drilling machine for boiler shells
1911 Machines for drilling marine boilers. 
1917 Advert for gear cutting and hobbing
1927 Advert for gears of all types
1938 Acquired by R. W. Crabtree and Sons.