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Roda Kren Katrol is a simple type of aircraft that serves to facilitate human work. The main part of the pulley consists of a small wheel that rotates on its axis and has a certain groove along its sides which will be wrapped around a rope / cable / chain. Pulleys that are used together with a rope or chain are used to lift heavy loads or to change the direction of power. The principle of working a pulley is to pull or lift an object using a wheel / shaft so that it feels lighter
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