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CLAVEL Y CIA
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Un aparato señalador automático para todas clases de libros caracterizado por llevar una chapa o lámina ligeramente curvada y en forma de lengüeta, la cual se introducirá por la ranura superior del lomo del libro el que haya de ser adoptado el aparato, llevando a todo su largo y en el sentido horizontal, hechas una serie de ranuras o aberturas entre las cuales llevando acopladas con movimiento de giro una varilla en forma de escuadra.