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Well, the type writer and the telephone would be the first things that come to mind.

The incandescent light bulb is another one. - I think this would only qualify as an revolution to the communications of America if you factored in it being used as a light signal on boats, and even that is arguable. While it is a major invention, I don't see it as a communication revolution.

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14y ago

What else can I help you with?