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A different approach to the walker is the rollator, also called wheeled walker, invented by the Swede Aina Wifalk in 1978. Wifalk had polio . [ 9 ] [ 10 ] Although originally a brand name, "rollator" has become a genericized trademark for wheeled walkers in many countries, and is also the most common type of walker in several European countries.
Six-wheel drive vehicle (6x6) Eight-wheel drive vehicle (8x8) Ten-wheel drive vehicle (10x10) Twelve-wheel drive vehicle (12x12) 18 wheeler; Many tracked vehicles such as tanks; Most rolling stock have more than four wheels, due to trucks having four wheels each, with multiple trucks per vehicle being common
A two-wheel drive vehicle has two driven wheels, typically both at the front or back, while a four-wheel drive has four. A steering wheel is a wheel that turns to change the direction of a vehicle. A trailer wheel is one that is neither a drive wheel, nor a steer wheel. Front-wheel drive vehicles typically have the rear wheels as trailer wheels.
A screw-propelled vehicle A screw-propelled vehicle is a land or amphibious vehicle designed to cope with difficult terrain, such as snow, ice, mud, and swamp. Such vehicles are distinguished by being moved by the rotation of one or more auger-like cylinders fitted with a helical flange that engages with the medium through or over which the vehicle is moving. They have been called Archimedes ...
Differential Drive Controller [ edit ] One might face a situation where the velocity V {\textstyle V} and the angular velocity ω {\textstyle \omega } are given as inputs, and the angular velocities of the left ω L {\textstyle \omega _{L}} and right wheels ω R {\textstyle \omega _{R}} are sought as control variables (see figure above).
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