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Why are these 3 letters on almost all of my zippers? | Developments Today
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Why are these 3 letters on almost all of my zippers?
Why are these 3 letters on almost all of my zippers?
Veritasium
·
Mar 19, 2026
·
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Making A Giant Zipper To Explain How It Works
Why are these 3 letters on every other zipper?
