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Humphrys, Tennant and Co of Deptford were makers of steam engines and stationary engines. 
Previously Humphrys, Tennant and Dykes
1861 Letter to "The Times" from Humphrys and Tennant.
1882 Humphrys, Tennant and Co, of Deptford Pier, London SE
1891 Humphrys, Tennant and Co, of Deptford Pier, London SE
1894 Triple expansion engines for the Russian Battleships Poltava and Tri Sviatitelia
1899 Engines for The Royal Yacht Victoria and Albert
1905 "Humphreys" was spelled with "e" in The Engineer
1907 Humphrys, Tennant and Co announced the closure of the works at Deptford Pier, blaming this on the higher wages that had to be paid in the London area, the higher cost of coal and materials, and the much higher rates in London, especially the rating of machinery