it would help if you could somehow split your query into different messages for different locations/towns. If that is possible at all.
This might help because several of your names are really common around here (Vienna, Austria) and difficult to trace, like Franz Kern - that's the name of my next door neighbour for instance ...
Summers is an Americanized version of Sommer (as to Sommers: that's pretty unusual, not sure whether you'll find anybody with this surname). Mautner can also come as Mauthner (you have listed this one as well), Knap as Knapp.
Mihaly btw is a very common Hungarian given name (Michael), the surname Mauther in turn is German(-Austrian). This would indicate origins in the old Austro-Hungarian monarchy of before 1918 - see this map if you haven't had one already http://www.geocities.com/historyofaustria/austriamaps1.html