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The early form of linear motion bronze bushing, is placed in a row in a row of wooden sled. Modern linear motion bearings using the same kind of works, but sometimes with a ball instead of GEBK spherical plain rad. The simplest rotary bearing sleeve bearings, it's just a bush sandwiched between the wheels and axles. bearing manufacturers was subsequently FZL Aluminum Cage Ball Retainer Bush is to use a lot of cylindrical roller replace the original liner, each rolling element as a single wheel.In 1883, Friedrich Fischer proposed the use of appropriate production grinding machine of the same size, roundness accurate idea of the ball, laid the foundation for industrial bearing suppliers. British O. Renault Thor were found mathematical analysis, Reynolds equation is derived, from laying the foundation for hydrodynamic lubrication theory.