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Una grúa perfeccionada, caracterizada esencialmente por estar constituida mediante un carril convencional sustentado por caballetes desmontables, el cual sobresale al menos respecto de uno de dichos caballetes, teniendo acoplado un mecanismo elevador por cable provisto de un asidero a través del que se desplaza mediante fuerza muscular a lo largo del citado carril, y estando uno de los caballetes que sustentan a este último provisto de ramas abatibles que actúan como apoyos de seguridad para el operario.
Kone, jossa on lisäelinten välityksellä työkappaleen kanssa puristusko sketukseen saatettava ja puristuskosketuksesta irrotettava pakkokäyttö inen syöttölaite.