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The suitable size of an umbrella for one person, the that for two people. On rainy days, it's often seen that when two or more people are sharing an umbrella, the insufficient coverage often leave parts of the body soaked. The spiral umbrella is a breakthrough in the structure of a traditional umbrella, allowing those using it to configure its size by twisting on the handle. The size of the umbrella expands in a spiral pattern, keeping its users from getting rained on. When one is using it alone, the umbrella can also be retracted to allow the ease of walking.
National Taiwan Uni. and Technology