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Repel Windproof Travel Umbrella, Teflon Coated Double Vented Canopy, Compact, Automatic (Black) - Walmart.com
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The physics behind this odd-looking, 'stormproof umbrella' from the Netherlands - The Washington Post
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Amazon.com: Repel Umbrella Windproof Travel Umbrella - Wind Resistant, Small - Compact, Light, Automatic, Strong Steel Shaft, Mini, Folding and Portable - Backpack, Car, Purse Umbrellas for Rain - Men and Women :
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