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UNA ESCALERA EMPALMABLE caracterizada esencialmente por estar formada por una diversidad de tramos acoplables uno sobre al otro de tal forma que puede alcanzarse la longitud deseada a cuyo efecto los largueros laterales que delimitan su contorno han sido provistos en su zona terminal de una oquedad interior en la que ajusta un rebajo en grosor previsto en que delimita una espiga la zona terminal superior de cada larguero lateral