Eli,
I am truly impressed by your discoveries regarding the fate of your
ancestor in WWI. I am very interested in learning about your research
in this area.

Regarding your final questions about abbreviations found in the
listing of your ancestor >from the WWI Casualty and POW lists located
on the Czech National Library website, I have some answers for you and
the community.

'Gefr' means Gefreiter. During WWI, this translates to a rank of
First Private. It is a rank just above infanterist and I believe that
it is a rank that would have been given to a soldier in WWI with past
experience like a reservist. Additional information can be found at
http://www.austro-hungarian-army.co.uk/badges/badges.htm
http://en.wikipedia.org/wiki/Gefreiter

'IR' means Infantry Regiment.
'Nr 30' means number 30.
which means he was part of regiment 30 which was recruited out of
Lemberg (Lviv),

During the last IAJGS conference, I put together a list of websites
for researching Galician soldiers in World War One. I placed it
online at the Rohatyn Jewish Heritage site so it would be public.
https://sites.google.com/site/rohatynjh/rsrg/ww1

Alex Feller
Chicago, IL