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1945 the Ball Bushing bearing was invented by John Thomson Sr.. The
bushing was the solution to the stick slip problem in the linkage used
to change pitch of propeller blades in aircraft. Ball bearings
eliminated the stick-slip, binding, and chatter of plain bearing. Ball
re-circulation virtually eliminates wear and provides a constant
coefficient of friction as low as 0.001.
The Steel ‘A’ bearing was released in 1953. The 'A' bearing design is still being produced today.