Panasonic M drivers : what are these ?

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I opened up my panny HTIB bookshelves and this is what i saw on the drivers back.
There a "M" . Yes an M.
The 12cm Yellow flat dust cap rubber surround midwoofer is:

T12P40A6.

And the 25mm semi dome tweeter is a :

T16KH09A6.

I was planning on modding them with your help if i were to get the T/S paramaters and stuff.

Thanks !