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The MCQ: In which one of the following year, mercury vapor lamp was invented; "Fluorescent Lighting MCQs" App Download [Free] with answers: 1823, 1899, 1912, and 1901 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google e-Book (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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