: The first Kodak camera
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The first Kodak Camera
The international spread of the Great Depression
The similarities between the 20th and 21st centuries lie in innovations. The 20th and 21st centuries have been periods of great strides in technology and other areas.
Radio was not an important invention in the early 20th century. Instead it was developed by Heinrich Hertz in the 18th century. The cotton gin (APEX)
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