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Amazon.com: Fresnel Lupa de lente, diámetro de 3.937 in, longitud focal de 3.937 in, lente acrílica (no vidrio), para aula de física, calefacción solar, lupa, longitud focal de 3.937 in : Industrial y Científico
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Amazon.com: uxcell 10 Pcs Bookmark Ruler Magnifier Fresnel Lens 3X Magnifying Sheet : Health & Household
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Amazon.com: 2 Lighted Magnifiers – 6X 3X Pocket Magnifier with Light, 3X Lighted Fresnel Lens Credit Card Size Magnifier, Use as Pocket Magnifying Glass with Light for Travel or Reading Magnifier Lens
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Amazon.com: Lupa de lente de fresnel, pequeña, 6 unidades : Salud y Hogar
8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV
