Inventions e-Book's MCQs - Complete
Dewar Flask Quiz App Free Download & e-Book - 141
Apps:
MCQ:
The first thermos was patented by
- Sir James Dewar
- Sir Etienne Montgolfier
- Sir Alfred Nobel
- Sir Henri Giffard
a
Inventions App & e-Book Tests PDF Download
Electrophotograph MCQs
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