National Inventor's Day is observed in the USA every February 11, commemorating the birth of renowned inventor Thomas Alva Edison, who holds over 1,000 patents in the U.S. and approximately 3,000 in other countries. This holiday was proclaimed by Ronald Reagan in 1983 to honor inventors and their contributions to society. While there are no special events officially associated with this day, enthusiasts often celebrate it with appropriate ceremonies and activities. Other countries also observe similar days, but on different dates; for instance, Germany, Switzerland, and Austria celebrate on November 9, the birthday of inventor Hedy Lamarr, while Argentina observes it on September 29, in honor of László Bíró, the inventor of the ballpoint pen. In Hungary, Inventor's Day is marked on June 13, the anniversary of the registration of the patent for synthesized Vitamin C by Albert Szent-Györgyi.