Black Rocks, in the UK, at E3 5c is one of the world's first-ever routes. 1950s 1950 : John Salathe and Allen Steck climb Steck-Salathe on Sentinel Rock, Yosemite, 5.8 A3, in a 5-day push. 16 pitches. Yosemite's longest wall climb. 1951 : Joe Brown, wearing tennis shoes, onsighted Right Eliminate, at E3 5c or , at Curbar Edge, UK, a poorly-protected off-width crack that is 50 feet long. 1952 : Lionel Terray, Guido Magnone make the first ascent of Mount Fitzroy (11,020 feet), Patagonia, 16 pitches of Alpine rock climbing, 5.9 with some aid. 1952 : Bonnie Prudden leads the first ascent of Bonnie's Roof, (5.8, A0) Shawangunks, NY. 2 pitches. 1952 : John Streetly leads, onsight, the first free ascent of Bloody Slab, at E3 5b (5.10a X), in Llanberis Pass, in Wales 1952 : Chuck Wilts publishes A Climber's Guide to Tahquitz Rock starting the Yosemite Decimal System, where climbs are rated from 5.0 to 5.9. 1952 : Cesare Maestri makes the first free solo of the 44-pitch Solleder Route on Monte Civetta, in the Dolomites, at grade UIAA VI- (5.9-). 1952 : Joe Brown, threading pebbles for protection, leads Cenotaph Corner, in Dinas Cromlech, Wales, one of the boldest traditional climbing routes at E1 5c or . 1952 : Harry Rost leads Talseite on Schwager, Schrammsteine, in Saxon Switzerland, at Sax VIIIc (today all free at IXa) or , one of the world's hardest routes. 1952 : Hermann Buhl, free soloed the first free ascent of Piz Badile on the 8th ascent, UIAA VI+ (5.10a), 21 pitches in 5 hours. 1953 : solves Le Joker, in Fontainebleau, France, considered one of the first-ever boulder problems. 1953 : invents the "kernmantle rope" with an abrasion-protective outer sheath, making nylon ropes even safer. 1954 : Joe Brown and Don Whillans climb the West Face of Aiguille de Blaitiere, 15 pitches including the famous Fissure Brown (5.10b R), in the Alps. 1955 : Walter Bonatti did one of the greatest big wall climbs in history with a solo, single-push, first ascent of a new route on the Southwest Pillar of the Dru over six days. 1957 : and lead the 3,000-foot Philipp-Flamm on Monte Civetta, in the Dolomites. Longest Alpine free climb at UIAA VI+ (5.10 R). 1957 : Royal Robbins, Jerry Gallwas, Mike Sherrick climb the NW Face of Half Dome, Yosemite, in 5 days. 25-pitches, 5.7 A3,