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of Twinlock Works, Beckenham, Kent. Twinlock Export Limited: 37 Chancery Lane, London, WC2. Telephone: Chancery 8971. Cables: "Ebullient, London". (1947)
Records available from 1905 to 1993. London Metropolitan Archives. 
Percy Jones (Twinlock) Ltd was the major supplier of hand-bound loose-leaf ledgers to the Stationery and Printing trade for approximately the first seventy years of the twentieth century.
1905 Company founded.
1920 Public company.
1932 Patent - Improvements relating to loose leaf ledgers and the like. 
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Loose Leaf Books, systems, Mechanised Accounting Equipment. Loose Leaf Metals, Mechanisms and Fittings. (Olympia, Ground Floor, Stand No. B.1455) 
1956 Patent - Improvements in or relating to runners or skids. 
1961 Manufacturers of loose leaf books and office mechanisms. 900 employees. 
1965 Name changed to Twinlock Ltd
1967 Started preparing for the demand likely to arise from the UK's decimalisation; was able to draw on the company's experience with such changes in Australia and South Africa, so expanded the Sheerness factory
1969 Subsidiary Twinlock Computer Services formed a joint venture with a German company on computer data processing accessories and equipment
1972 Became a public but unquoted company
1974 Had 15 factories worldwide. Acquired The Shannon business systems and office equipment group of new Malden, Surrey, the first time that Over-The-Counter shares had been used for a take-over.
1976 The National Enterprise Board provided capital to support the company; a rights issue was not practicable because of the OTC nature of the shares but the NEB offer raised concerns from one director and from a competitor.
1978 The company returned to profit
1981 NEB sold much of its holding to Scottish American Investment Trust
1983 Acquired by Acco World Corporation of Chicago