Simion Bunn, a foundryman from Pennsylvania, was a bricklayer in his youth. He became a furnace builder for Belleville Steel Co. which operated two mills in the city — Valley Mill and West Mill. In 1871 Bunn patented a Puddling Furnace and in 1886 a “double-decker” Nail Plate Furnace. His sons followed him in the stove and foundry industries of Belleville. Simion enjoyed and worked at a long career. At the age of 65 he was still installing furnaces. In 1910, Simion Bunn Sr., installed an annealing and smelting furnace for the Allegheny Valley Malleable Iron Co. of Missouri. In his spare time he led a brass band, playing the trumpet and bugle. He died October 11, 1913.