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Manómetro perfeccionado del tipo de los que funcionan a base de conducto resorte cegado por un extremo y unido por el otro a la boquilla de entrada del fluido caracterizado en que el citado conducto resorte presenta en su parte media una zona en espiral de sección ligeramente aplanada estando el extremo cegado unido a través de una biela a un sector dentado de tipo conocido que transmite la presión a la aguja indicadora.