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Mini Stirling engine phone charger A Stirling engine is a heat engine that is operated by the cyclic expansion and contraction gas. Invented by Scottish clergyman and engineer Robert Stirling in 1816. The gadget is made by Hong Kong's Nikola Toy and costs £59. Check out my Oct sponsor PatWorld: Patent Intelligence Platform & IP Research Services - https://2ly.link/20bfn #engines #mechanicalengineering #charger #inventions #innovation #creativity #technology #future #engineering #research #science #design