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We can use this cup very usefully when we read books, newspapers, explanation of medicines or products and also when reading very small letters or minute particles. eyesight can be used very usefully without magnifier but using a cup of glass to magnify materials.for din-ink.
Hannam Univercity
Daejeon, South Korea
Byung hoon Lee,
Kyung chan Hwang
Hannam Univercity
Daejeon, South Korea
Sun hwa Kim, Sung kyu Yang, Hyo dong Lee, Dong gil Lee, Jeong won Han
