Aspects of this topic are discussed in the following places at Britannica.
...a pair of two-way radio communications products for the police and military. The first was an AM-band police-radio system adopted later that year in Bowling Green, Kentucky; the second was the Handie-Talkie (see photograph), an AM-band, handheld device with a long antenna that ultimately was used by soldiers during World War II. Both AM-based systems were quickly superseded by FM...
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