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Escalera del tipo de las portátiles de ramas desiguales articuladas y montantes tubulares que se caracteriza porque los peldaños están constituidos por perfiles angulares que van empotrados y sujetos convenientemente por los extremos de la rama determinativa del apoyo para los pies en ranuras previstas en los montantes contra los que van aplicados exteriormente las otras ramas de cada perfil.