A professional who tends machine that prints graduations and numerals on enameled wooden slats used in folding rules, and automatically inserts printed slats in drying racks. Responsibilities include:

• Stacks blank slats in magazine of printing machine.
• Positions empty racks in feed magazine of slat-inserting mechanism.
• Starts machine and observes printing and racking processes.
• Examines printed slats for printing defects, and compares them with master rule to verify accuracy of graduations.
• Stops machine and clears jams in feeding mechanisms, using screwdriver.
• Replaces broken shearpins, using fingers.
• Lifts racks of printed slats from machine to handtruck.