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The white stick gets a 21st century makeover: £30 smart cane uses SONAR and vibrations to help blind people 'see' | Daily Mail Online

http://www.dailymail.co.uk/sciencetech/article-2663715/The-white-stick-gets-21st-century-makeover-30-smart-cane-uses-SONAR-vibrations-help-blind-people-see.html

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