Guía de Referencia de la Asociación de Fibra Óptica (FOA) Sobre Fibra Óptica: Guía de estudio para la certificación de la FOA (Libros de texto de referencia de la FOA sobre fibra óptica, Band 1)

The items bear minimal signs of past use, such as light scratches or memories in the form of markings. These signs of wear give the items a charming character and tell stories of their previous owners, while not affecting their functionality.