patents.google.com
Google Patents
https://patents.google.com › patent › EP1962024A2 › de
patents.google.com
Google Patents
https://patents.google.com › patent › EP1962024A2 › de
books.google.com
dw.com
patents.google.com
bpb.de
bpb.de
dw.com
patents.google.com
link.springer.com
deutsche-rohstoffagentur.de
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