This dimension groups energy pioneers by nationality. Wikipedia defines nationality as "the legal status of belonging to a particular nation." Browsing this way collects every pioneer from the same country.
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Comparison
Era of Emergence Nationality
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Sources
1. Vapor-compression refrigeration - Wikipedia
WikipediaHistory, Jacob Perkins 1834 vapor-compression systemQuote, History, Jacob Perkins 1834 vapor-compression system
In 1834, an American expatriate to Great Britain, Jacob Perkins, built the first working vapor-compression refrigeration system in the world.
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