Also, I wouldn't get too hung up on trying to locate them in 'reality'. From a propmasters POV the 2nd and 3rd MM movie were a complete joy as many of the weapons were adapted or scratch built. A real challenge for the armourers for sure!
After the success of the first movie, the second was very much expanded and included some fantastic functioning improvised weapons. My personal favourite was 'The Mighty Wizz' arm mounted crossbow with 'push down' attached cocking lever. The third movie got the hollywood treatment in terms of buget, so the improvised 'post apocalypse' array of weapons is huge! I think the chained blades are just a great example of a weapon desigend and made for the movie.
If you DO want to hunt them down, then you could register on:
http://propreplicas.yuku.com/
And ask over there (I'm 'Battlestar Atlantia' over there).
BTW, fav scene? at 0.19? The little plane?