Inventors' Day in Germany, Austria and Switzerland
Inventors' Day in Germany, Austria and Switzerland is held on November 9. This event in the first decade of the month November is annual. 
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Inventors' Day is celebrated on different days in different countries. In Germany, Austria and Switzerland, Inventors' Day is on November 9, the birthday of inventor and Hollywood actress Hedy Lamarr.
National Inventors' Day was proclaimed in the USA by President Ronald Reagan on February 11, 1983, on the occasion of the birthday of Thomas Alva Edison, the most successful American inventor of all time in terms of the number of patents.
In Argentina, September 29, the birthday of ballpoint pen inventor László József Bíró, has been celebrated as Inventors' Day since 1986.
Inventors' Day in Argentina on September 29
International Inventor's Day on November 9
Inventor's Day in Thailand on February 2
Inventors' Day in United States on February 11
National Inventors' Day in Mexico on February 17
Invention Day in Japan on April 18
Bolivian Inventor's Day on April 23