Do folding (or telescoping) cross-country skis exist and if so are they useable?
Update: Or are there small cross-country skis that are short enough for easy transport, yet still capable of providing support for uphill movement?
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This question had two answers that unfortunately didn't survive the migration. I'll post what I've found, as well as one of the links from @Refineo's answer (the other link was a patent description). Here's a folding ski used to climb mountains, so not cross-country compatible:
In addition to @Refineo's links, I was also able to find some other websites, but nothing really conclusive, or useful.
Similar to the MTNapproach skis: http://www.climb.co.at/index.php?lang=en
Russian Patent holder of folding x-country skis: http://www.vector-ski.com/collski_e.html
Backcountry style, but no longer available for sale: http://www.zigzagtour.de/index2.htm
Home-made folding skis: http://www.woodly.de/blog/?p=41