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  2. Pinhole occluder - Wikipedia

    en.wikipedia.org/wiki/Pinhole_occluder

    A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the ...

  3. Concrete slab - Wikipedia

    en.wikipedia.org/wiki/Concrete_slab

    A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).

  4. Pinhole glasses - Wikipedia

    en.wikipedia.org/wiki/Pinhole_glasses

    Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

  5. Sam's Club memberships are only $20 during Black Friday - AOL

    www.aol.com/lifestyle/sams-club-memberships-are...

    It's the perfect time to sign up, too — Christmas is just around the corner, so you can grab the year's hottest gifts at those low, low Sam's Club prices. iPads are $100 off, matching family ...

  6. A McCormick victory would further pad Republicans' newfound majority in the Senate, where they will hold at least 52 seats after the election. The size of the majority could play an important role ...

  7. Kayaker's leg amputated after 20-hour rescue to free him from ...

    www.aol.com/news/kayakers-leg-amputated-20-hour...

    A medical team stayed with the man throughout the night. After they determined his condition was deteriorating, the decision was made to amputate his leg to facilitate his rescue.

  8. Concrete leveling - Wikipedia

    en.wikipedia.org/wiki/Concrete_leveling

    In civil engineering, concrete leveling is a procedure that attempts to correct an uneven concrete surface by altering the foundation that the surface sits upon. It is a cheaper alternative to having replacement concrete poured and is commonly performed at small businesses and private homes as well as at factories, warehouses, airports and on roads, highways and other infrastructure.

  9. Stamped concrete - Wikipedia

    en.wikipedia.org/wiki/Stamped_concrete

    Concrete stamping is the procedure which uses the concrete stamps to make the pattern in the stamped concrete. Concrete stamps are placed on the concrete after the color release has been applied. The concrete stamps are pushed into the concrete and then removed to leave the pattern in the stamped concrete.

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