Any know much abou the East German Schulz TH315 drivers?

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I recently stumbled across a pair in mint condition. Wan to know more about this driver which is seemingly famous. I remember back then Thorsten had a rave comment on it, but could not find much info on line. Also there seems to be many different version of it with serial number such as o17, o17a, o16, Type148, TH315 and TH315/1 etc. Confused but want to know more.
 
A quick search found some pictures and some people who use or know about them. But unless you speak German or Chinese/Japanese (not sure which), then you might have trouble communicating with them:
http://www.german-vintage-loudspeakers.com/navid.19/schulz-elektroakustik-mechanik.htm
http://www.tubebbs.com/thread-64534-1-6.html
http://www.rahaso.de/foren/usrposts.php?f=audiotreff_fullrange&page=1&name=DB&color=000099&full=1&
http://www.analog-forum.de/wbboard/index.php?page=Thread&threadID=44266
Neat in-built crossovers though!
 
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