459. A bluegrass or other small grass seed harvester. One would walk through the knee deep grass, swinging it back and forth. In between the large "teeth", there are small slots cut in the metal where the stem of the grass is forced during the swinging action. As the bucket continues to swing, the grass seed is stripped off the stem and captured in the bowl.
457. Hay knife -- for cutting hay loose when it used to be piled rather than baled. Now, livestock farmers use them when wanting to slice hay off a contolled portions from a large round bale. It's way easier to cut than trying to take a pitchfork and pull it loose.