Disklavier

Can anyone help me with some product terminology?  As far as uprights 
go, I have heard (read) MX100A, MX100B, MX100II, Mark II, MX80.  Are 
some of these the same with just differing referrences?  Is a "B" 
a "II" is a MX100II a Mark II?  Are they all the same.  Is someone 
could list all makes and their alias' in manufactured order and 
relative dates, that would be great.  

Thanks for any help at all, though!