I-Abstract: Lesi sihloko sihlaziya ikakhulukazi izici eziyisikhombisa ezithinta izinga lokudluliselwa kwezinto ezinamathelayo, okuhlanganisa okunamathelayo, ama-substrates, ama-coating rolls, ingcindezi yokumboza, noma ingcindezi yokusebenza, i-spe yokusebenza...
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