Dicycle (vehicle)
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A dicycle is a vehicle with two wheels parallel to each other, unlike the usual motorbikes and bicycles, which have a wheel followed by another, called tandem placed wheels.
US Patent Class 180/240 lists all the vehicles coming under powered dicycles. This class has patents related to unmanned folding vehicles to be used for tactical purposes by the US government. Other vehicles in this US Patent Class are mostly invented by Dean Kamen or his associates, like the Segway PT, a balancing dicycle.