Harry Brearley
Harry Brearley (18 February 1871 – 14 July 1948) was an English metallurgist, usually credited with the invention of "rustless steel" (later to be called "stainless steel" in the anglophone world).
Léon Guillet
Léon Guillet (11 July 1873 – 9 May 1946) was a French metallurgist, known for his work on stainless steels in the early 20th century.