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The Quiz: In which one of following year, helium extract process from natural gas was invented; "helium" App (iOS, Android) with answers: 1940, 1915, 1950, and 1910 for free online classes. Study inventions and inventors questions and answers, Google eBook to download free chapter for distance learning classes.
In which one of the following year, the helium extract process from natural gas was invented?
In which country the first mechanical calculator was invented?
In which one of the following year, a Clarinet was patented?
In which one of the following year, 3 D map-making system was introduced?
In which one of the following year, Tungsten Wire was invented?
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