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I am wondering about the open bearing casings that needed cleaning and greasing. Before the enclosed casings were implemented.

Hi all. My grandfather worked at Hoover Ball and Bearing in Ann Arbor, Michigan from about 1939 to 1950's. I am working on a book about WWII and ball bearings. I would like to hear from any of you who have information in this area or could point me to it. I would especially like to hear about in...