1793-1830, active 1820s, ironmonger; nail manufacturer; brassfounder, British Sparrow, Isaac Earlysman 1793 - 1830
1793-1860, active 1821-1826, optical & mathematical instrument maker, English; British Simms, William 1793 - 1860
1793-1864, inventor of a type of mechanical leech, French Heurteloup, Charles Louis Stanislaus 1793 - 1864