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Poleas progresivas acoplables entre sí caracterizadas por presentar en una de las caras de cada polea una cavidad de ancha boca interiormente dotada de una canal de mayor diámetro que dicha cavidad habiéndose previsto en la periferia de la repetida cavidad una serie de ventanas de forma de trapecio circular que comunican con la citada canal quedando las mismas regularmente espaciadas.
ES140063U1968-07-031968-07-03Poleas progresivas acoplables entre sí
PendingES140063U
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