Not no one. There is also getac, durabook, rugged series of some dell laptops, there is (was?) itrinix and probably a bit more that I don't really know of :)
I’ll drop ruggedpcreview.com here- no affiliation but have checked once in a while for years; they have a lot of press releases, if not reviews, of the rugged PCs available.
Great example of riches are in niches