Well, using e2fsck could not work since the primary superblock is damaged hand hence not writable. Instead, debugfs came to my rescue. It allows to enter the blocksize and the superblock to be used for filesystem to debug, and one can enter an interactive session or let run a script. Phantastic! Using ls as usual in the (comfortable) shell to locate the files to rescue and rdump directory destination to make a dump of the data solved the problem. Incidentially, running the whole thing from a Knoppix-CD was not a bad idea eiter: not being dependent of the possibly damaged files und being capable to copy the data into the ramdisk and from there to another computer via ssh was rather comfortable.
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