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atomatic vote recorder
thomas edison invents atomatic vote recorder -
telegraph system
thomas edison invent new telegraph system -
marie discovers polonium and radium
she anounces that her and her husband discover these new elements -
Radio Signal Broadcast
Marconi created a device to recieve morse code signals from england -
General Theory of Reletivity
Einstein completes his general theory of reletivity -
polio vaccine found
salk confirms that his polio vaccine is safe to use