Who uses MU on the shell holders

dead meat

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Bought some reloading odds and ends, some shell holders have a MU then a #. I haven't been able to track down who made these and find a chart to see what they fit. So far the MU-12 looks to fit 45-70 cases. One reference I found said they were Bonanza holders but haven't found out for sure yet. Any body know?
 
Found a couple references through Google - a guy says he just re-built a Bonanza B-1 press and was looking for shell holders - "These would either be marked "BSI" or "MU" and would have knurled sides and a 5/16" hole in the middle." A second reference to an MU-21 shell holder for an old Bonanza press for 45 Colt. A third mention of looking for an MU-4 for 41 Magnum.
And, as per what yomomma posted, an old eBay ad for a Bonanza MU-4 shell holder that had a picture of a shell holder in a Pacific package...
 
dead meat - fix the link and go here- there are pictures of an MU-1 shell holder in a Bonanza Co-Ax press that was bought new in 1984.
ht tp://www.predatormastersforums.com/forums/ubbthreads.php?ubb=showflat&Number=3011886&page=1
 
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