Tactile paving drill. Fullsize image: https://diqn32j8nouaz.cloudfront.net...l_fullsize.jpg Previously: Tactile paving drilling tool - photo Tactile paving machine - GIF Braille money labelling - GIF Internet browsing keyboard for the blind - GIF Braille micrometer for blind machinists - photos
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Makes sense, insert 3 spade bits and use it as a low buck electric jack hammer, or power scraper.
looks like typical Aussie ingenuity based on the GPO shape
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