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Austrian company Tec-Innovation recently showedsmartshoes that use ultrasonic sensors to help people suffering fromblindness or vision impairment to detect obstacles up to four me-ters away.Known as InnoMake,the smart shoe aims to become an al-ternative to the decades-old walking stick that millions of peoplearound the world depend on to get around as safely as possible.The currently available model relies on sensors to detect obsta-cles and warns the wearer through vibration and an audible warn-ing sounded on a Bluetooth-linked smartphone.That sounds impressive enough,but the company is already working on a muchmore advanced version that incorporates cameras and artificial in-