OBERHEIM SYNTH

Hi, I would like to know if this is correct...
When Oberheim was still in business, they made the Matrix-1000 with the black face.
Then Gibson Guitar bought Oberheim in 1986 and from then on all Matrix-1000 had the white face.
It was Gibson's idea to make the face white and any white Matrix-1000 were manufactured by Gibson Guitar.
Is this correct ? 

I have checked wikipedia and vintagesynth.com and there seems to be some
date errors like, if Oberheim closed in 1986 when gibson bought them (wiki) and vintagesynth.com
sates matrix-1000 production was from 1987 to
1994 then there would be never any black face units.

If any one could help to know when the white face started I'd really
appreciate it.