Lensless Spectacles(Pin hole 안경 ?) 미국 특허 Patent US1959915

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1) USA patent Link : Patent US1959915 - JSENSTESS-SPECTACLES - Google Patents:

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2) Wikipedia : http://en.wikipedia.org/wiki/Pinhole_glasses

3) Independent Article :  http://www.independent.co.uk/life-style/health-and-families/health-news/the-truth-about-pinhole-glasses-1253113.html