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Amazon.com : TIANSE Binding Machine, Spiral Coil Binder Machine, Electric Coil Inserter, 15 Sheets Punch Capacity, Suit for Letter Size / A4 / A5 Book Maker, with 100pcs 5/16'' Plastic Coil Binding
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Amazon.com : Binditek 50 Pack Plastic Spiral Binding Coils, 20mm(3/4"),170 Sheet Capacity,4:1 Pitch, Black Binding Spirals : Office Products
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