Amazon.com : OFFNOVA Binding Machine, 21-Hole 450 Sheets Paper Comb Punch Binder Machine for Letter Size / A4 / A5, Easy to Punch Handle, Adjustable Margin : Office Products
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Denaku DS1970 Comb Binding Machine | Office Warehouse, Inc.
Amazon.com : PPE C-12 Binding Machine, 21-Hole, Value Kit 100 PCS 5/16 Inch Comb Binding Spines, Comb Binding Machine Perfect for Letter Size, A4, A5 or Smaller Sizes Office Documents, Heavy Duty