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Inquiry on NBC

Inquiry on NBC

(OP)
Dear all!

Has anybody known about the NBC materials? i have checked this in the Internet but got no information, pls advise what is its compound and its function? if possible, pls advise me in the way it is produced too.

thanks a lot

Wish you nice day

RE: Inquiry on NBC

(OP)
Dear IRstuff!

Actually, it is just the materials used in the Headphone named Screen, and the specification cites its materials: NBC, i have no idea how to learn about this. Pls help

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