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Refrigerator
William Cullen invented refrigeration -
Lightning
Started using lightning as an energy source -
Battery
batteries were invented by Alessandro Volta -
Heat Pump
the heat pump was introduced -
Oil
started using oil for energy -
Telephone
Alexander Graham Bell invented the telephone -
Light Bulb
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First Hydroelectric Dam
Lester Allan Pelton invented the hydroelectric dam -
Automobile
people started using automobiles -
Electron
Joseph John Thomson invented electrons
