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Percival Norton Johnson (1792–1866) of Johnson, Matthey and Co
1817 Percival Norton Johnson established a business as a gold assayer, in London.
1832 Johnson took George Stokes into partnership and the business then became known as Johnson and Stokes.
1835 The partnership ended when George Stokes died.
1837 Johnson then took W. J. Cock into partnership and the company became known as Johnson and Cock.
1851 George Matthey joined the company which was then renamed Johnson and Matthey