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References
- ↑ O. Gregory, A Treatise of Machanics, vol 2, (London 1806), 511; J.Nicholson, The Operative mechanic, (London 1825), 405; A. J. Warden, The linen trade: ancient and modern (1864; repr. 1967), 690-92; B.Barber, 'John Kendrew & Company, Flax Spinners, 1787-1794', Cleveland History no. 32 (1976/77), 1-3.
- ↑ D.J.Bryden, 'The Ribrights, Opticians in the Poultry, London: and the use of powered machinery for working lenses and mirros at Tewin (Herts), Bromley (Kent) and Darlington (Co. Durham), Bulletin of the Scientific Instrument Society, No 105, (2010), 10-21.