ocr: SLIDER - UPPER . - B , - 7 L - L - - a - WEDGE - LOWER- LOWER WEDGE WEDGE SLIDER Inside the zipper's slider is a triangular upper wedge that forces the teeth apart when you unzip a garment. Zippingup fastens the two rows ofteeth as they pass between the two lower wedges.
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(Dorling Kindersley).iso/article3/zipp/zipp0z.dib/zipp0z.png)