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Mark LI don't know about visiting the Louisville Slugger factory itself, but I know that some of the fellas at Game Used Universe (gameuseduniverse.com) are willing to share what they know for a small membership fee.  As you may know, there are enormous gaps in the records, not only from the 20's but up through the 60's.  But I think it's always worth a try.  Would you be willing to share some names here?  There's always the possibility that someone has a side-written bat or other evidence that might help.