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David Melville invented it. The design was a way for people to save energy and have a more efficient method for lighting.
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René Théophile Hyacinthe invented it.This invitation gave rise to one of the most important and ubiquitous medical instruments. It's good for the public health.
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An American engineer Jacob Perkins invented it. It can help people to stockpile foods for longer time.
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Samuel Slocum invented it. It can make people's life easier.
