It was designed to PULL volunteer corn out of soybeans.
Sometime in the mid to late '70s, we had a lot of corn go down before it could be harvested, and quite a bit of that corn then sprouted and grew the next spring. Wouldn't have been a real problem except everyone then was doing a corn/soybean rotation, which meant that the volunteer corn was then growing in the soybean crop. Not only did the corn compete with the beans for moisture, but that corn was going to be a real problem when it was time to harvest the beans.
That was the year that some creative souls came up with that wheeled contraption. You drove through the beans, with that machine hovering just barely above the bean plants, and those wheels would grab the stalk of volunteer corn and pull it right out of the ground, or at least damage it enough that it ceased to be a problem. It actually worked quite well
The weed-wiper came on the market about that same time.