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Free "helium Notes" App (iOS & Android) with MCQ: In which one of the following year, the helium extract process from natural gas was invented?; with answers: 1940, 1915, 1950, and 1910 for invention academic exploration. Study inventions and inventors questions and answers, Google e-Book to download free chapter to support invention online instruction.
MCQ 491: In which one of the following year, the helium extract process from natural gas was invented?
MCQ 492: In which country the first mechanical calculator was invented?
MCQ 493: In which one of the following year, a Clarinet was patented?
MCQ 494: In which one of the following year, 3 D map-making system was introduced?
MCQ 495: In which one of the following year, Tungsten Wire was invented?
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