Inventions Practice Tests
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The MCQ: In which one of the following year, the helium extract process from natural gas was invented; "helium" App Download (Free) with answers 1915, 1940, 1910 and 1950 for free online classes. Solve inventions and inventors quiz questions, download Google eBook (Free Sample) for distance learning classes.
MCQ 1: In which one of the following year, the helium extract process from natural gas was invented?
MCQ 2: The process to extract helium from natural gas was invented by
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