Don't be limited by the snow. Wheelblades clip onto the front wheels of wheelchairs. They distribute weight over a broader space, so they won't get stuck in light snow. Patrick Mayer, the inventor, hopes to begin selling them in October.
Link -via Technabob | Official Website
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I don't know if these qualify as an invention as I've seen them on wheelchairs before at the Sapporo snow festival.
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