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The first solar panel was invented
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the first working solar train invented
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The development of solar eduipment started developing to make solar stuff work even better
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The first solar cell was made which made it to where the solar power is now more portable
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The first siclicon solar panel was invented for cheaper solar panels
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The first cell phone was made
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The cell phones started replacing the mobil phones
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Nakia made and sold their first cell phone ever
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IPhones started taking over the cell phone industry
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