Jonsered chain saws have been around in N.America for around 30 years, but distribution has been somewhat spotty.
Husqvarna, Jonsereds, Partner, Pioneer, Poulan, and maybe some other names are wholly owned by Electrolux AB, of Sweden. At one time all made separate products, but now there are really two...Husky/Jonsereds and Poulan, with the better quality stuff being the Jonsereds and Husky, (and a steadily shrinking line called "poukan Pro") and the lower=end poulan stuff. Some of the really small Huskys and Jonsy's are made in the poulan factory in Louisiana, too.
All of the above have websites, but the Poulan site has been under construction for months.
To the best of my knowledge, Jonsereds has only one model that has no corollary in the Husqvarna line; it's the 2083II, which is the same saw as the old 2077 updated for EPA. I have a 2077; it's a good saw, but newer models will perform with it and weigh slightly less.