A professional who changes code slugs (printing dies) and installs rolls of ticket tape in ticket dispensing machine before each race at racetrack. Respnsibilities include:

• Unlocks machine with key and turns knob to reset number register to zero.
• Changes code slug so that different symbols are printed on tickets.
• Replaces depleted roll of ticket tape, threading end of tape through feed roller to type roller.
• Presses key of machine to obtain sample ticket.
• Examines ticket to ascertain that machine is printing correctly and adjusts machine to correct defects.
• Relocks machine.