Sankyo, Bisty, Lumina.

Can anyone clarify the relation between these three words??

Is 'Lumina' a style of frame manufactured and used by 'Sankyo' or is the Lumina frame manufactured by another company (Lumina?) and used by Sankyo??

And where do 'Bisty' come into this??

I have searched the forums a bit and seen the frame page with both Sankyo and Bisty badged onto a Lumina style frame but I was wondering how the three fit together.

The bottom line is 'Who manufactures what'.??

Just curious.