A professional who tends machines that clean and grade seed corn. Respnsibilities include:

• Starts machines and opens chute gate to permit corn to flow through series of vibrating screens.
• Adjusts chute slides to regulate flow of corn to reciprocating screens and revolving cylinders that separate corn kernels, according to width, thickness, and length.
• Examines graded kernels for uniformity, using test screen.
• Replaces defective screens and cylinders.