Introduction dates of Mongrel (Grendel) A, B, C, D, and possibly also Prime configurations may be incorrect. MUL lists them as 3053 (3052 for Prime), however according to Battle of Tukayyid book all of these configurations were present on Tukayyid in May 3052. Moreover according to TRO 3058U during Clan invasion era Grendel was produced only on Arcadia - one of the Pentagon Worlds over 1000 light years away from Tukayyid, which, considering the number of jumps required to cross distance between the factory and the battlefield, makes me think that first Mongrels were more likely produced in late 3051 at the latest, rather than early 3052. Therefore if both Battle of Tukayyid book and TRO 3058U are correct, at least one of the above configurations should probably be listed as introduced in 3051 (or even a bit earlier), and all of them definitely no later than in 3052.