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At the top, it looks scary': Bingley celebrates Five Rise Locks restoration | North of England | The Guardian
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waterproofing - In the Panama Canal, how are the lock gates kept water-tight (at the hinges, middle, and bottom)? - Engineering Stack Exchange
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How does a lock work - Saint-Ours Canal National Historic Site
Lock 38 at Canal Exploration Center (U.S. National Park Service)
