None.
Since 1953 clothing and equipment needed to climb Mount Everest has changed a lot. Take a look at the article in the link given to see what Edmund Hillary would of worn and the equipment he used.
Edmund Hillary took essential climbing equipment, warm clothing, food supplies, and a camera with him on his successful expedition to summit Mount Everest in 1953.
Edmund Hillary would take essential equipment such as high-quality climbing gear, cold-weather clothing, a tent, sleeping bag, food supplies, crampons, ice axe, ropes, oxygen tanks, and a communication device. Additional items may include a stove, fuel, first aid kit, and navigation tools.
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Hillary tent manuals are designed to be used to set up tents and to be sure that you have the right equipment and pieces prior to beginning the setup. The manuals come with the tent when you purchase it.
Sir Edmund Hillary, during his historic ascent of Mount Everest in 1953, took a range of essential equipment, including oxygen tanks, climbing gear like crampons and ice axes, and specialized clothing for extreme cold. He also carried tents, sleeping bags, and cooking equipment to support the expedition. Additionally, the team utilized high-altitude boots and goggles for protection against the severe conditions. This carefully selected gear was crucial for their successful summit attempt.
Sir Edmund Hillary's exploration of Mount Everest in 1953 was funded by a combination of private donations, funding from the British government, and support from organizations such as the Royal Geographical Society. Hillary also secured sponsorship from various companies for equipment and supplies.
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Sir Edmund Hillary used specialized mountaineering equipment such as ice axes, crampons, ropes, carabiners, and a variety of climbing gear for his historic ascent of Mount Everest in 1953. His equipment was designed to withstand harsh weather conditions and provide support for climbing steep and icy terrain.
Edmund Hillary and Tenzig Norgay climbed Mount Everest in 7 weeks in 1953
Charles Evans and Bourdillon were the first pair to attempt the summit, and successfully reached the South summit. However, they were unable to take their expedition any further because they had problems with the equipment that they were carrying, and they were also running out of time. Just two days later, it was the turn of the second pairing; Edmund Hillary and Tenzing Norgay. With the aid of standard oxygen equipment, the climbing pair were able to reach the summit on the 29th of May.
By strength, by experience, and by training, using suitable equipment including oxygen. Don't forget that Sherpa Tensing was right there with him.