The first widebody type to use this sort of latter described arrangement (a flight management system, IE: FMS, which also included full time engine thrust management in the mix) was...the Lockheed TriStar.
However Litton and Delco equipped aircraft with the typical 3 unit installation always had triple mixing and DME position updating available to them with no FMS required.
This post in no way intends any disrespect towards the mighty ten eleven 411. 