Inventions MCQs (Grade 8) From Textbook
Free Toothbrush Notes App | Inventions e-Book PDF Download
Inventions Competitive Exam MCQs – Mock Test 163
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The MCQ: In which one of following year, toothbrush was patented; "Toothbrush Notes" App (iOS, Android) with answers: 1723, 1780, 1765, and 1748 for online study. Study inventions and inventors questions and answers, Google e-Book to download free chapter for online elementary school.
In which one of the following year, toothbrush was patented?
Early stroller was developed by
In which one of the following country, mouse pad was patented?
Sphairistike, which evolved into modern outdoor tennis was discovered by
In which country, chemical foam extinguisher was invented?
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