The following is a pictorial time line created to display the Zoid releases as well as dates. I did the basic research, and after speaking with Lionel over at Ultrasaurus Red and some discussion on Zoids Poison we have come to the conclusion that this chart is as close as we can get accuracy wise.
Or, if you prefer, here is a more "animated" version:
This has been a Zoid.US production. No image may be used without permission. © 2008 -WIKD