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In page Nikola Tesla:
"Tesla obtained around 300 patents worldwide for his inventions.[4] Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives. There are a minimum of 278 known patents[4] issued to Tesla in 26 countries. Many of Tesla's patents were in the United States, Britain, and Canada, but many other patents were approved in countries around the globe.[5] Many inventions developed by Tesla were not put into patent protection.[citation needed]
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