For sale is a vintage John Deere Truss Frame Plows Hitch Calculator, a rare dealer giveaway promotional tool used to assist farmers in determining proper hitch settings for John Deere plows. This slide-rule style calculator is a unique piece of John Deere history and a great collectible for agricultural enthusiasts.

For sale is a vintage John Deere Truss Frame Plows Hitch Calculator, a rare dealer giveaway promotional tool used to assist farmers in determining proper hitch settings for John Deere plows. This slide-rule style calculator is a unique piece of John Deere history and a great collectible for agricultural enthusiasts.