Dewar Flask App Download | Inventions Quiz PDF e-Book
Inventions Practice Test 29
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The MCQs: First thermos was patented by "Dewar Flask" App (Android, iOS) with answers: sir etienne montgolfier, sir james dewar, sir henri giffard, and sir alfred nobel for school certificate. Practice inventions and inventors questions and answers, Google e-Book to download free sample for online education.
The first thermos was patented by
Which one of the following invents the traffic lights with three colors?
In which one of the following country Silver photo was discovered?
Which one of the following is an inventor of Ballpoint?
The first laser was invented by an American engineer named as
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