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This Day In Hiytory
Martyr's Day Of Panama
the tearing of a Panamanian flag during protests regarding US sovereignty over the Panama Canal Zone led to several days of deadly fighting (1964)
Autogiro
aeronautical engineer Juan de la Cierva made the first successful flight in the helicopter-like aircraft he had invented, in Madrid (1923)
Daguerreotype
L. J. M. Daguerre announced the first practical photographic process to the French Academy of Sciences (1839)