Hi Marc,
I just stumbled across some information in
Luftwaffe Verband Issue Number 31, page 20. Nigel Moore, whose source was a book about Tempelhof airfield, states that Aslau was a plant of Weser
Flugzeugbau G.m.b.H., and was established in 1943 for FW 190 production.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com