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8 янв 1928 г. - Sistema de radio móvil AM unidireccional inventado para la policía.

Описание:

El patrullero del Departamento de Policía de Detroit, Kenneth Cox, y el estudiante de ingeniería, Robert L. Batts, crearon una forma para que la policía reciba llamadas de emergencia en sus patrullas.

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Byivan salviulo
30 мар 2022
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8 янв 1928 г.
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~ 97 г назад
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