Inventions Practice Tests
Inventions Online Tests
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The MCQ: In which one of the following year, diphtheria vaccine was invented; "Diptheria" App Download (Free) with answers 1924, 1913, 1976 and 1903 for online elementary school classes. Solve inventions and inventors quiz questions, download Google eBook (Free Sample) for online study.
MCQ 1: In which one of the following year, diphtheria vaccine was invented?
MCQ 2: The first successful vaccine for diphtheria was developed by
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