Hello Willie,  Have you researched the families associated with the printers?  I am currently working on my family tree and last name of Neftelberger.  I was wondering if you dug into the Fraenkel family tree.    (re: Naphtali Saloman)
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TracieLyn O'Brien-Rydzewski (Family Name: Neftelberger/Adler)
Lilliesjourney@...
Researching my Jewish family tree

I have recently published two articles about Hebrew printing in Bavaria on
the RIJO web site:
1) "The Hebrew Printers of Sulzbach in Upper Palatine"
http://home.t-online.de/home/RIJONUE320043754386-0005/sulz01.htm
(do not miss viewing selection of frontispieces, see table of contents)

2) "Thoughts on the cradle of Hebrew printing in Bavaria"
http://home.t-online.de/home/RIJONUE/320043754386-0005/heprint.htm

Willie Glaser St. Laurent Quebec, Canada willie.glaser@...