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5 Cards in this Set
- Front
- Back
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tools made of stone, control of fire and the wheel
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stone age
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metal tools, agreculture and military. casting of metals and glass
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bronze age
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first alphabet and the calender. invention of cement
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iron age
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trade increased, windmills rockets and gun powder
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middle ages
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steam engine, factories telegraph, the telephone, invention of the cotton gin, radio airplanes migration to the cities
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industial age
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