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4.2 20th century. 4.2.1 1900s. 4.2.2 1910s. 4.2.3 ... The timeline of historic inventions is a chronological list of particularly important or significant ...
20th-century percussion instruments (21 P) Pages in category "20th-century inventions" The following 128 pages are in this category, out of 128 total.
21st century; Timelines; 19th century; 20th century; 21st century; ... Boy Scouts of America is founded. ... Invention of the optical disc and the cassette tape.
A timeline of United States inventions (1890–1945) encompasses the innovative advancements of the United States within a historical context, dating from the Progressive Era to the end of World War II, which have been achieved by inventors who are either native-born or naturalized citizens of the United States.
The following articles cover the timeline of United States inventions: Timeline of United States inventions (before 1890), before the turn of the century; Timeline of United States inventions (1890–1945), before World War II; Timeline of United States inventions (1946–1991), during the Cold War; Timeline of United States inventions (after ...
The 20th century saw mathematics become a major profession. As in most areas of study, the explosion of knowledge in the scientific age has led to specialization: by the end of the century there were hundreds of specialized areas in mathematics and the Mathematics Subject Classification was dozens of pages long. [72]
Matthew's invention is color-changing building bricks that the fourth grader (he skipped two grades in school) named aquabricks. ... NJ boy, 7, awarded patent for Lego-inspired invention. Show ...
20th Century Fox presents in New York on an 8 m × 4 m big screen the first widescreen movie. The radio station Witzleben begins in Germany with the regular broadcasting of television test broadcasts, initially on long wave with 30 lines (= 1,200 pixels) at 12.5 image changes per second. It appear first blueprints for television receiver.