Possible Clues:

• They cut quite a swath
• Grain cutters
• Bush hooks, e.g
• Grain-cutting tools
• Crop cutters
• Wheat whackers
• In South Carolina they designed sails, initially, for cutters
• Sights in Sargent's 'Reapers Resting in a Wheatfield'
• Corn-cutting tools
• Cutting tools