19th-century Belgian inventors

Désiré Charles Emanuel van Monckhoven (1834–1882) was a Belgian chemist, physicist, and photographic researcher. He was also an inventor and author.

Charles Joseph Van Depoele (27 April 1846 – 18 March 1892) was a Belgian-American electrical engineer, inventor, and pioneer in electric railway technology, including the first trolley pole.

Antoine-Joseph "Adolphe" Sax (French: [ɑ̃twan ʒozɛf adɔlf saks]; 6 November 1814 – 7 February 1894) was a Belgian inventor and musician who invented the saxophone in the early 1840s, patenting it in 1846. He also invented the saxotromba, saxhorn and saxtuba, and redesigned the bass clarinet in a fashion still used to the present day. He played the flute and clarinet.