SERVICIOS DE MANTENIMIENTO PREVENTIVO Y CORRECTIVO A LOS CUATRO EQUIPOS DE RAYOS GAMMA PARA INSPECCION SIN INSTRUSION DE CONTENEDORES TRANSPORTADOS POR TRAILERS Y POR FERROCARRIL CON FUENTES RADIACTIVAS DE COBALTO 60 Y CESIO DURANTE EL PERIODO DE 17 DE ABRIL DE 2009 AL 16 DE ABRIL DEL 2010

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