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of Honeysome Road, Chatteris, Cambridge.
c1870 The company was established by Samuel Charlton Armitage and traded as Armitage and Co
Soon after the formation Charles Richardson Ruston was taken into partnership
1875 Steam engine at Burrowmoor.
By 1876 they were manufacturing and repairs agricultural machinery and introduced a single cylinder portable engine
1876 Details of their 8-hp portable engine. Armitage and Ruston. 
1876 Partnership dissolved. '...the Partnership heretofore subsisting between us the undersigned, Samuel Charlton Armitage and Charles Richardson Ruston, at Chatteris, in the Isle of Ely, in the county of Cambridge, as Engineers, Ironfounders, and General Commission Agents, under the style or firm of Armitage and Ruston, was, on the 25th day of January, 1876, dissolved by mutual consent. All debts owing from or due to the late firm will be discharged or received by the said Samuel Charlton Armitage, who for the future will carry on the business on his own account...'
1882 Company liquidated. '...Liquidation by Arrangement or Composition with Creditors, instituted by Samuel Charlton Armitage and Francis Sowerby Ruston, both of Chatteris, in the Isle of Ely, in the county of Cambridge, Agricultural Engineers and Commission Agents, trading under the style or firm of Armitage and Ruston....'