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also you can buy for 72€ the ECA Vrt-disk2002
for exemple you can buy the CD at http://www.stquentin.net/
(very good mostly for transistor,diodes,
old databooks have good cross references also.
right Partminer or "freetradezone" is a good
source but it's expensive for a private use.
also some manufacturers hides their
cross reference sometime you can only make
a search; not access a list.