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1861 Born at Leamington
1871 Living at Buriswood Crescent, Leamington: Harry Mulliner (age 43 born Northampton), Carriage Manufacturer employing 42 men and 17 boys. With his wife Ann Mulliner (age 39 born London) and their children Ernest Mulliner (age 14 born Leamington), Arthur F. Mulliner (age 12 born Leamington), Herbert H. Mulliner (age 10 born Leamington), Annie R. Mulliner (age 8 born Leamington), William M. Mulliner (age 5 born Leamington), Maud Mulliner (age 4 born Leamington), Ida C. C. Mulliner (age 2 born Leamington), and Walter G. Mulliner (age 11 months born Leamington). Also his niece Charlotte A. Bowman (age 17 born Stamford). Four servants. 
Late 19th century: H. H. Mulliner and F. Wigley were in business in Birmingham making scientific measuring instruments and tools for making the more complicated parts of ordnance (Mulliner-Wigley Co and Wigley-Mulliner Engineering Co). They acquired premises in Birmingham to supply ordnance for the Boer War but found problems in supervision so transferred operations to a 60 acre site in Coventry with good rail and canal connections where extensive works for manufacture of ordnance were laid out
1903 Further developments were made in ordnance, including a 9.2 inch garrison mounting for the War Office. The need for obtaining special steels led to amalgamation with Messrs Cammell of Sheffield; Mr Mulliner joined the board of Cammells.
1905 In order to produce naval ordnance, with its very different requirements, the Ordnance Works were organised into a separate company owned jointly by Cammell, Laird and Co, Fairfield Shipbuilding and Engineering Co of Glasgow and John Brown and Co of Clydebank and Sheffield. H. H. Mulliner became managing director.
1924 Death at The Albany, London, aged 63