Thomas Brown (1795- )
1840 Thomas Brown married Sarah Harfield in London[1]
1845 Went into business in London.
1851 Thomas Brown 56, patentee, lived in London City South East, with his step-daughter Katharine J Harfield 25 and his step-son, William H Harfield 18, assistant draughtsman[2]
c.1854 William Horatio Harfield was taken into partnership by his step father Thomas Brown (1795- ), as Brown and Harfield