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A defibrillator is a medical device that is used to save the life of someone who is suffering from a cardiac arrest. They scan the heart to determine whether a shock is needed and if so will deliver one. If a defibrillator is used within the first minute of someone falling ill, chances of survival can be as high as 90%. But, when was it invented and has it changed much since the original design?The first ever external defibrillator that is known today was invented in 1930 by electrical engineer …