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Hace 4 días · 1931: The electron microscope is invented by Ernst Ruska. 1933: FM radio is patented by inventor Edwin H. Armstrong. 1933: Harry C. Jennings Sr. and his disabled friend Herbert Everest, both mechanical engineers, invented the first lightweight, steel, folding, portable wheelchair with their "X-brace" design.
Hace 4 días · Thomas Edison (born February 11, 1847, Milan, Ohio, U.S.—died October 18, 1931, West Orange, New Jersey) was an American inventor who, singly or jointly, held a world-record 1,093 patents. In addition, he created the world’s first industrial research laboratory.
Hace 4 días · In 1931, Tatra built the V570 prototype, which featured an air-cooled flat-twin engine mounted at the rear. Hitler and Porsche both were influenced by the Tatras. [45] Hitler, an avid automotive enthusiast, rode in Tatras multiple times during political tours of Czechoslovakia and had frequent dinners with Ledwinka. [45]
Hace 3 días · The Japanese military invaded Manchuria in 1931, and from 1937 the conflict escalated into a prolonged war with China. Japan's attack on Pearl Harbor in 1941 led to war with the United States and its allies.
Hace 2 días · The later ruler was in turn replaced by Admiral Aznar-Cabañas in February 1931, soon before the scheduled municipal elections of April 1931, which were considered a plebiscite on the Monarchy. Urban voters had lost faith in the monarch and voted for republican parties.
Hace 4 días · España 1931, una constitución de avanzada – Rebelion. Por Daniel Campione | 27/05/2024 | España. Fuentes: Rebelión. Entre los motivos para recordar a la Constitución de la segunda república...
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