On March 7, 1888, Graham Steell (1851 - 1942) gave a lecture in Manchester on "The auscultatory signs of mitral obstruction and insufficiency" and presented an auscultatory early diastolic murmur caused by pulmonary hypertension, which was later named after him (Fraser 1991).
Austin Flint (1812 - 1886), a New York internist, suggested the mechanism of origin of a particular murmur by aortic valve insufficiency as early as the mid-19th century . This sound was then named after him as the Austin Flint sound (Gahl 2014).