In the past most of the headphone if not telling all of them, were used by telephone operators and radio technicians but in the 19360th they redesigned for public usage and we see they are useful and well designed. They allow use having the sound of music individually and setting the sound in a way preventing negative feed backs from neighbor. The process begin here by this melting mole machine producing plastic back cover preventing sound reflecting into the headphone. In the factory the make diaphragm for producing sound. This machine make plastic part and they will be assembled with other parts, for assembling plastic part skill is needed for making the best sound quality.
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