| 摘要 |
A process for producing a speaker grille cover having bands of imperforate metal that have a physical appearance and or audio performance which can be altered or improved to meet styling and/or audio performance objectives. The process comprises these steps, not necessarily executed in the sequence listed: piercing and expanding a sheet of metal to manufacture an area of expanded metal; and interposing an area of imperforate metal between areas of expanded metal. The product made thereby is a speaker grille cover having an area of expanded metal; and bands of imperforate unexpanded metal that are bounded by an area of expanded metal.
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