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Diving Unlimited International (DUI) is an American diving equipment designer and manufacturer. DUI is particularly well-known among recreational and technical divers as the maker of high-end drysuits. DUI also manufactures drysuits and associated products for all the branches of the US military and friendly foreign military around the globe.

DUI has several patents related to diving equipment and drysuits. The company was founded in 1963 by avid diver Dick Long. DUI's manufacturing facility and main offices are located in San Diego, CA.

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