GT Advanced Technologies Inc fka GTAT

[Netsurfer]

I do not believe that the furnaces used for the "proof of concept" boules differed from those ultimately installed in Mesa.
The recipe may well have been changing.
Both Salem or Merrimack had operational systems back to early 2012. In one of the early Docket items Apple actually listed yield data indicating that Mesa was making some acceptable boules in the 265 Kg size....just nowhere near agreed upon yields. There were very few that fully met the specs and some larger qty had "some" yield.