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of 34 Cockspur St, London, chronometer, clock and watch makers
1856 Richard Edward Dent died intestate; presumably his widow, Marianna Frederica Dent, continued the business at Cockspur Street under her initials.
1860 Business advertised - watchmaker
1861 One of the successor businesses of E. J. Dent and Co
1870 John Smith, Manager to Messrs. M. F. Dent and Co., Chronometer, Watch, and Clock Makers, of Nos. 33 and 34, Cockspur-street, Charing-cross, gave patent notice in respect of the invention of "improvements in instruments for timing ships'logs."
1892 M. F. Dent held the Royal Warrant for chronometers
1905 By appointment to the late Queen Victoria
1906 address as above 
1913 The name of the business was M. F. Dent
1915 The name of the business was M. F. Dent
1916 address as above 
1920 Absorbed into E. Dent and Co