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Radio communications are associated in most people's minds with broadcastingthe "glamour girl" among the many radio services administered by the Federal Communications Commission. This is not unnatural in view of the popularity of the aural and visual media of communications and entertainment; their impact upon public opinion; and the broadcasters' not inconsiderable influence in the halls of Congress. But the world of radio communications neither begins nor ends with broadcasting. Equally important to our economic life and national security, though much less publicized and glamorized, are the mobile services of virtually infinite variety which more and more help the wheels of our complex economy to turn smoothly. These mobile radio services may best be described as the "work-horse" radio services. They are: the police and fire radio services, which enable cruising police cars and fire trucks to be in constant communication with their respective headquarters; the industrial radio services, which permit the managers of industrial enterprises, building contractors, power utilities, oil companies, etc., to maintain contact with and control over widely-dispersed vehicles; the land transportation radio services, which provide similar control over and contact with trucks engaged in the pickup and delivery of property, interstate busses, and taxicabs cruising the city streets; the marine and aviation radio services, which supply safety communications for ships at sea and aircraft in the air; and the common-carrier mobile services, which provide communications for hire to the public. Each service is governed by a set of regulations which prescribe who may hold an authorization and how it may be used after it is issued by the FCC.1

Development of Mobile Radio Communications. The "Work-Horse" Radio Services