Download Vaccum Tube MCQ App | Inventions PDF e-Book
Inventions Practice Test 118
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The Quiz: In which year first vacuum tube was invented "Vaccum Tube" App Download [Free] with answers: 1976, 1904, 1924, and 1903 for online certifications. Solve inventions and inventors questions and answers, Google Book to download free sample 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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