MANTENIMIENTO DE SUBESTACION ELECTRICA 23 Kv CON TRANSFORMADOR DE 500 Kv RECICLADO DE ACEITE ELECTRICO A TRANSFORMADOR TRIFASICO 3 FASES 4 HILOS 23000 VOLTS 220/117 VOLT DE CORRIENTE ALTERNA EN EL PATRONATO DE OBRAS E INSTALACIONES DEL I.P.N.

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