Inventions Practice Tests
Inventions Online Tests
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The MCQ: In which one of the following year, spark plug was patented; "Spark Plugs" App Download (Free) with answers 1903, 1906, 1905 and 1908 for elementary school graduation certificate. Solve inventions and inventors quiz questions, download Google eBook (Free Sample) for distance education.
MCQ 1: In which one of the following year, spark plug was patented?
MCQ 2: Spark Plug was invented by
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