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of St. Katherine Works, Sciennes, Edinburgh. Engineers and Makers of Paper Mill Machinery, Rubber Mill Machinery, Rubber Plantation Machinery, and Linoleum Mill Machinery.
1845 Another company, which became James Bertram and Son, was established by George and William's younger brother.
1884 Messrs. Bertram established the St. Katharine’s Works, Bow, London
1888 Bertrams, the company, was registered on 12 July, to take over the business of George and William Bertram, engineers; William Bertram and David Noble Bertram were the only Bertrams who were directors; the third brother (presumably John) had retired (living on private means in 1891 census).
1898 Became public company. It was decided to reconstruct the company.
1914 Engineers and manufacturers of machinery for paper mills, rubber mills, rubber plantations and linoleum mills. Employees 400. 
1920 Bertrams acquired an iron foundry in Westfield Avenue, Gorgie
1961 General engineers and iron founders (casting up to 25 tons) Makers of paper mill, rubber, linoleum, explosives, asbestos making and milk drying machinery. Specialists in the manufacture of machine tools for sheet metal workers and structural engineers. 360 employees. 
1974 James Bertram and Son of Leith closed
1980s saw the decline and ultimate collapse of Bertrams.
1981 The foundry at Westfield closed in 1981 and the company itself went into liquidation the following year.
Bertrams Sciennes Limited lasted until 1985, when the factory closed.
A working model of a Bertams papermaking machine, used by papermakers for experimental purposes, is on display at Manchester's Museum of Science and Industry.