Construcciýn de la primera etapa de alcantarillado sanitario, consistente en suministro e instalaciýn de tuberýa con junta hermýtica de 38 y 45 cms. de diam., para la construcciýn de colectores, asý como pozos de visita y descargas domiciliarias, en la localidad de Rosales, municipio del mismo nombre en el estado de Chihuahua.

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