QUARTZ DISC

Digital video disc (DVD) stamper players, compact discs (CDs), digital video disc- ROM (DVD-ROM) stamper players, stamper players for recordable digital video discs (DVDs), electronics components, computer peripheral equipment, recordable digital video discs (DVDs) and digital video disc-ROM (DVD-ROM) signal testers, recordable digital video discs (DVDs) and digital video disc-ROM (DVD-ROM) pre-write and after-write signal testers, identification code checking machines, recordable and rewritable optical disc, namely digital video discs (DVD+R or DVD-R), double layer digital video discs (DVDR DL), compact discs (CDR), mini-discs, and optical disc with format using blue-violet laser to read and record