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Inventions Study Guide: Mock Test 118
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The MCQs: In which year first vacuum tube was invented; "Vaccum Tube" App (Android, iOS) with answers: 1976, 1904, 1924, and 1903 for online certifications. Practice inventions and inventors questions and answers, Apple Book to download free chapter for online school courses.
In which year the first vacuum tube was invented?
Which one of the following invents AC?
In which one of the following country cheese slicer was invented?
The decimal point notation was introduced by
The fire was first controlled by humans anywhere from about
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