Mini-copter stars at robot show
The world's lightest and smallest robot helicopter has been unveiled at a Tokyo exhibition by the Seiko Epson company.
The designers say the 70-mm-tall device could be used as a "flying camera" to enter earthquake-shattered buildings. The prototype four-legged robot weighs 10 grammes and although it flies by remote control, it has to be linked to an external power source via a cable.
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