Johann Friedrich Steinmann 1819–1872 Source: Wikimedia Commons About Johann Friedrich Steinmann scientist People from the Same Era Lajos Beregszászi 1817–1891 musical instrument maker, piano maker Békés Henriette-Caroline Mennechet de Barival 1813–1861 composer, pianist Paris Miguel Samper Agudelo 1825–1899 businessperson, lawyer, politician, writer Honda Wilhelm Marx von Marxberg 1815–1897 jurist, police officer Židlochovice John Rock 1825–1866 dentist, lawyer Salem Harriet Sophia Richards 1821–1893