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| a hollow cast-iron cylinder attached to the wheel that forms part of the brakes | |||
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| a mechanism that puts something into automatic action | |||
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| a restraint used to slow or stop a vehicle | |||
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| a braking device consisting of a combination of interacting parts that work to slow a motor vehicle | |||
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| a restraint that slows airplanes as they land on the flight deck of an aircraft carrier |