Well, that was quick - thanks.
The original summit route ascended, finally, in 1943 after Pablo Fisher and Gustavo Kammerer overcame the final 40-foot slab guarding the summit. They initially spent an hour-and-a-half trying to throw an iron hook over the top, but eventually resorted to drilling seven one-inch metal rods- the holes of which are still visible as you climb past and clip the modern bolts protecting the steep, thin face.