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of Boundary Street, West Gorton, Manchester and King's Lynn.
Reference to Slater's Directories and contemporary maps (Alan Godfrey Maps) shows that the works was located at the junction of Boundary Street and Malpas Street, close to the junction of Hyde Road and Birch Road.
1885 Wells' "Unbreakable' pulleys advertised for sale by John Donald & Son, stockists in Glasgow
1891 Advert: 'TO ENGINEERS. - TO BE LET, possession in March, the Commodious WORKS, occupied by the Unbreakable Pulley Company, 66, Ogden-street, Ardwick ; large new steam boiler, by Foster.—J. H. HAGUE, 63, Brown-street.'
1894 Price list issued 
1911 Pamphlet on the Benn friction clutch 
1913 Advert. Shafting, pulleys, bearings and Benn clutches 
1917 Advert. Clutches, shafting, roller bearings etc. 
1919 Advert. Clutches, shafting, roller bearings etc. 
1924 The company was in voluntary liquidation
1934 The business, works and tools were auctioned