Juan de la Cierva (from
Murcia, Spain ) was a Spanish aeronautical engineer who invented the helicopter/autogiro, with a freely rotating rotor.
Isaac Peral was a spanish engineer who invented and built the first electric battery-powered submarine, to travel inside the ocean for the Spanish Navy. It was the first submarine with the first electric battery-power.
And these
inventions are related to volume, mass and velocity you know!!
Karl Benz, from
Germany, invented the car.
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