What was the height and width of the first submarine?
Who became the founder of the electrified system?
What did the guard do when enemies appeared?
Who confirmed that it was the Ukrainians who initiated the development of the X-ray machine?
Under whose leadership was the first human flight into space?
What prompted Volodymyr Melnykovy to create ecological fuel for cars?
Who became the first customer of the helicopter?
What was the method of extracting salt from sea water?
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