Robert McCormick invented a hempbrake, but it was his son Cyrus who came up with this machine
[DOC] [TLE] Cyrus Hall McCormick (1809 - 1884) - Genealogy - Geni [PAR] Apr 15, 2016 ... Genealogy for Cyrus Hall McCormick (1809 - 1884) family tree on Geni, ... Often 
credited for inventing the Reaper, which was created by a black ... to sell a hemp 
brake machine to farmers in Kentucky but made no sales.