A professional who operates offset-duplicating machine to reproduce single or multicolor copies of charts, schedules, bulletins, and related matter, according to oral instructions or layout and stock specifications on job order. Responsibilities include:

• Installs sensitized metal printing plate or master copy of plastic-coated paper around press cylinder of machine and locks plate or master copy into position, using handtools.
• Turns handwheel and ink fountain screws to regulate ink flow.
• Selects paper stock to be printed according to color, size, thickness, and quantity specified, stacks paper on feed table, and positions spring guide on side of paper stack.
• Turns elevator crank to raise feed table to paper height.
• Sets dial controls to adjust speed and feed of machine according to weight of paper.
• Starts machine that automatically reproduces copy by offset process.
• Cleans and files master copy or plate.
• Cleans and oils machine.
• May prepare printing plates.
• May operate stencil-process or spirit-duplicating machines and photocopy equipment.
• Important variations may be indicated by trade names of machines used.