• Letterhead of R. Burger & CO
  • The German patent of the x-ray tubes (No. 129974)
  • The sons of Reinhold Burger
  • Invoice of the American Thermos Bottle Company billing R. Burger (1922)
  • Trademark for the name "Thermos"
  • Label of thermos flasks
  • The Germant patent of the thermos flask (No. 170057)
  • Photo of Reinhold Burger (Chicago)
  • Invoice of R. Burger & CO (1908)
  • Cover of the catalogue of the American Thermos Bottle Company
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