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Johnson, D.  (2008, January 03). Davidson, Sir Samuel Cleland (1846–1921), inventor of tea processing machinery and manufacturer. Oxford Dictionary of National Biography. Retrieved 24 Jan. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-46863.