Robert McCormick invented a hempbrake, but it was his son Cyrus who came up with this machine
... 
invention in the Reaping Machine and that he had written to his brother Cyrus at 
.... father told me the invention was a family concern, but I always understood that 
your [DOC] [TLE] Cyrus Hall McCormick - Cyrus's Life [PAR] Cyrus grew up in Rockbridge county VA at Walnut Grove ( Family Farm ) .