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Zippers!
Stuff You Missed in History Class
How Did Sunback's Fastener Break Through?
By autumn of 19 13, the first fasteners were rolling off the production line in meadville. The new fastener had been kept under wraps, so nobody outside of a small circle in the company was the wiser of this yend. Zipper teeth, which are often called scoops, have a little bump on one side and a little divet on the other. This is all described in detail in sundbac's patent, which he filed in august of 19 14.
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