A professional who operates keyboard of tape perforator machine to type visible proof copy and copy data from manuscript onto tape used for producing automatic type composition. Responsibilities include:

• Secures roll of tape and blank stationery in machine magazine.
• Turns adjustment screws to set indicator scale that controls counting mechanism according to type size and width of line to be composed.
• Positions copy in copyholder and depresses keys on keyboard to punch tape.
• Observes justification (even margin) points on indicator scale to determine when to end line.
• Removes completed roll of tape for delivery to typesetting machines.
• May be designated by type of machine operated as Justowriter Operator.