How the Modern Zipper Came Together

A zipper joins two flexible edges with a slider small enough to hold between two fingers. Pull one way and separate teeth interlock into a continuous chain. Pull the other way and a wedge inside the slider separates them. That reliable motion looks like one invention, but it emerged through decades of patents, difficult manufacturing, failed products, and incremental changes. Historical education based on the cited record. Where origin claims are disputed, the episode distinguishes evidence from popular retellings. Sources and further reading: - Smithsonian National Museum of American History, Sundback's Modern Slide Zipper Patent Model: https://americanhistory.si.edu/collections/object/nmah_860486 - Smithsonian Libraries and Archives, The Up and Down History of the Zipper: https://blog.library.si.edu/blog/2010/05/03/the-up-an-down-history-of-the-zipper/ - United States Patent and Trademark Office, Gideon Sundback and the Zipper: https://www.uspto.gov/learning-and-resources/journeys-innovation/historical-stories/gideon-sundback