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Zippers!
Stuff You Missed in History Class
Hookless Fastener Company vs Gideon Sunback
The big distinction was that the design by codmus had featured round bumps and scoops. Sunbak had rectangular divots and bumps. He had determined that round would allow too much movement of the teeth t they would swivel and pop apart. So he came up with a shape to prevent that swivelling motion. Once the teeth were stacked together, they flexed as a unit, but not at each touch point.
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