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RESONANCE TYPE SOUND EXPANDER IN A MUSIC BOX
RESONANCE TYPE SOUND EXPANDER IN A MUSIC BOX
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机译:音乐盒中的共振型扩音器
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摘要
PURPOSE:Scaling up of vibrating sound in a music box by contacting a mounting screw head in a fixed stand of sounding lead plate with a resonance inervention box solidly adhered to main resonance plate which is arranged in an outside box.
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