These are roughly in chronological order
Heritage - Licensed for the Bakshi animated film so probably through Tolkien Enterprises (Heritage and a few other companies produced Not-LoTR figures through the 70s).
Grenadier - I have never seen these, based on the titles of the box sets I'm wondering if this was a sub-license through ICE and hence back to Tolkien Enterprises (?)
Games Workshop - 1985 took over from Grenadier
Mithril - Took over the GW license in '87 I believe that this license is through the Tolkien Estate
RAFM? Only a post here in the forum plus one blog post mentions that RAFM may have had this license. This is news to me.
Ral Partha - to the best of my knowledge Ral Partha never had an LoTR license. However, at one time they were the official US distributor for Citadel miniatures and RAFM so there could be confusion here.
Black Tree/IKON/Harlequin - mid to late 90's or so. This license must have been through Tolkien Enterprises as they essentially lost it when the current films were released. (the license was not withdrawn but they couldn't produce miniatures for gaming purposes and they didn't have the sculpting quality to go head to head with Mithril for display miniatures).
Games Workshop - Movie release to present. License through Tolkien Enterprises
If you have pictures of some of these old lines to prove that they existed that would be cool.
Edited by Heisler, 21 March 2012 - 08:26 AM.