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In followup to my previous post re early German dominance in ball-bearing manufacture: Apparently it owes to Friedrich Fischer's invention of the ball grinder in 1887. Here is a link about FF and his grinder: http://www.fag.com/content/en/company/history/from-1883-to-1914/history-1946-1960.jsp

davemccoull wrote: " I find it strange an American truck has so many metric parts i.e. bearings and oilseals" Somewhere recently I read an explanation of this American metric bearing anomaly, where an entire design will specify measurements in units of inches except for the bearings which are...