A professional who tends keying machine that prints coded data on paper stock used to promote sale of magazines. Responsibilities include:

• Ascertains stock and code information to be used.
• Removes printing head from keying machine, inserts specified type in holder, and replaces head.
• Adjusts machine for size of stock and loads stock in paper guides on machine table.
• Starts machine that automatically prints code, and observes operation to determine whether print is legible.
• Removes processed stock from machine.