Which wartime product innovation was originally developed as the SCR-300 backpack radio in 1942, revolutionized battlefield communications, and later influenced the development of civilian mobile communication technology?

Throughout military history, certain product innovations have revolutionized warfare and shaped the outcomes of major conflicts. These technological breakthroughs often began as specialized military equipment before finding their way into civilian applications. This poll tests your knowledge about a significant military product innovation that transformed battlefield communications and later influenced civilian technology worldwide.

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The walkie-talkie, developed by Motorola for the US Army Signal Corps, weighing 35 pounds and allowing troops to communicate on the move for the first time in military history
The field telephone, developed by Western Electric for trench warfare, using copper wire connections that could be rapidly deployed by specialized communication units
The heliograph mirror system, developed by British Army engineers, using reflected sunlight to transmit Morse code messages up to 30 miles without power requirements
The signal lamp, developed by Naval Research Laboratory, using focused electric light beams to transmit coded messages between ships without radio detection risk