Have never seen/heard of a 2-row, though they may exist. As others have said, your picture is of a cultivator designed to cultivate the 'middles'......one middle. Not a good picture from google images, but this is a one-row walking cultivator, of which there were untold thousands in my part of the world and were in use 'til the late '40s-early '50s. The mules and the cultivator straddled the row, as did the plowman until the crop was so large that he had to walk off-center. They were also made in 'riding' versions, which weren't used around 'here'.