My original video, incorrect in length, was uploaded by a different user (email@example.com)and needs to be deleted. This new video is the correct version.
VIDEO BY: JoannWest Scranton High School
VIDEO BY: KatherineAdams Central HS
VIDEO BY: KatrinaRobert F. Kennedy HS
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Nylon valve, 1940s–1950s
©2010 Chemical Heritage Foundation