The need for and impact of two-way radios in the global cement industry

摘要

A lot has happened since the first two-way radio was invented by Australian policeman Frederick William Downie in 1923. The development of two-way radios, or walkie-talkies as they are also known, was initially driven by the needs of the military, but they have since been used in many different areas and industries throughout the world. They have now evolved into devices that are compact, lightweight, and highly functional. In terms of industry size, two-way radios are now as big as cell phones.