for critical messaging.

History

The first telephone pager system was patented in 1949 by Al Gross. Intended for the use of physicians, there was initial resistance to the idea of being permanently on-call, according to Gross.

One of the first practical paging services was launched in 1950 for physicians in the New York City area. Physicians paid US$12 per month and carried a 200 g pager that would receive phone messages within 40 km of a single transmitter tower. The

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