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GrubAmericana on Twitter: "On September 20, 1842 Sir James Dewar was born. Inventor of the vacuum flask, also known as Dewars Flask or Thermos. https://t.co/6dUyY166pq" / Twitter
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थर्मस फ्लास्क के अविष्कारक जेम्स डीवार | Biography of James Dewar | Inventor of the Thermos Flask - YouTube
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