Nonelectric signaling and sound-producing devices — hand bells, door gongs, cowbells, and similar articles — occupy a narrow but commercially distinct niche within base metal manufactures, serving markets from livestock management to decorative retail. The heading encompasses parts, so replacement clappers, yokes, and mounting hardware of base metal are captured here alongside finished units. Because these articles are purely mechanical and decorative in nature, no mandatory admissibility review by a federal agency applies at entry. Classification disputes most often arise when electronic components are integrated, which would redirect the article to electrical apparatus headings.

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