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A. Shanks of Dens Iron Works, Arbroath, Forfarshire.
of 66 Victoria Street, London, SW1.
See Alexander Shanks
1840 Company established to manufacture portable steam engines, iron bridges and steam cranes.
1842 Patented a lawn mower which cut and rolled the grass in a single operations. Possible similarities to one produced by Edwin Budding
1845 Alexander Shanks died; his son James Shanks took over the business.
1851 Exhibited at The Great Exhibition the 42 inch machine - "Shanks's five-drummer".
1852 Shanks' improved hand-drill.
1853 Company moved to Dens Iron Works
1855 Patent awarded for improvements to the mower
c.1860 Opened London office at 27 Leadenhall Street.
Concentrated on agricultural and horticultural implements, and of marine and land engines, in addition to lawnmowers
1870s Promoted some railway locomotives.
1878 Supplied a glass and iron tropical garden to Gothenburg.
1891 Block setting crane sent to Liepaja, Russia (Latvia). 
1894 High-speed engine for dynamos. 
1894 Became limited liability company. James' sons (Alexander, James, Frederick, and David) moved to control the business.
c.1900 Entered the i/c engine market with oil types rated from 1.5 to 25 hp
1913-1917 For a list of the models and prices of Petrol Motor Commercial Vehicles see the 1917 Red Book
1922 Manufacturer of steam engines and oil engines lawn mowers, malleable iron castings, etc.
1937 Engineers. "Rajah" Motor Mowers. "Triumph" Gang Mowers. 
1949 Introduced a vertical single-cylinder water-cooled diesel engine rated 8 bhp at 1,200 rpm.
1961 Manufacturers of lawn mowers and grass cutting machines. 250 employees. 
1968 The company was taken over by Giddings and Lewis-Fraser