In 1938 Alfred J Gross invented the first walkie talkie. The U.S. Government kept this communication system classified (secret) until 1976.
He was fabricating his own metal radio chassis in a metal working class at age fifteen. A year later he earned his amateur operator's license. He was now a ham radio operator.
After Gross invented the walkie talkie he created a two-way air-to-ground communication system in 1941, which was used in the Second World War. The nickname for the ground device, “Joan,” communicated over radio waves. Gross continued to develop and patent various cordless and portable telephonic devices through the 1960s.