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William Marshall of William Marshall and Son
c1812 Born at Gainsborough
William Marshall was an agent for William Fairbairn and Sons
c1837 Birth of son James Marshall
c1840 Birth of son Henry Dickenson Marshall
Worked in St Petersburg for several years
1842 He branched out on his own and purchased the defunct engineering works of William Garland and Son at Back Street Foundry in Gainsborough.
1848 Company established as Britannia Ironworks
1851 Living at Back Street, Gainsborough (age 39 born Gainsborough), Millwright and Engineer. With wife Frances (age 39) and children James (age 14 born Manchester) and Henry (age 10 born Manchester). Also niece Janet Kearton (age 2 born Manchester). 
1861 Living at Trinity Street, Gainsborough (age 48 born Gainsborough), Master Engineer employing 21 men and 10 boys. With son James Marshall (age 24 born Stalybridge), Engineer. One servant.