What does the Z mean on Russian tanks?
What does the Z on Russian tanks mean? The letter "Z" on Russian tanks indicates that it is an experimental model or a prototype, which has not yet been officially adopted by the Russian army.
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Who invented the helicopter?
Who invented the helicopter? The inventor of the helicopter was Igor Sikorsky. Igor Ivanovich Sikorsky was a Russian-American aeronautical and mechanical engineer who designed and built the...
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