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See Mirrlees for history
1868 On the failing health of William Tait, partner in Mirrlees and Tait, Mr Watson (later Sir W. Renny Watson) was taken into partnership and the title of the firm became Tait and Watson or Mirrlees, Tait, and Watson (depends on source of information).
1870 William Tait died but the title of the firm remained unchanged until 1882.
1885 Mr. A. Robertson and J. C. Hudson, who had been for some time in the management of the business, were admitted as partners and the title of the firm changed to Mirrlees Watson Co.