Inventions MCQs (Grade 8) From Textbook
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The MCQ: In which one of the following year, mercury vapor lamp was invented; "Fluorescent Lighting" App Download [Free] with answers: 1823, 1899, 1912, and 1901 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google eBook (Free Chapter) for school certificate.
In which one of the following year, mercury vapor lamp was invented?
Mercury vapor lamp was invented by an American Electrical engineer named as
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