What is the proportion of material cost to total production cost for voice amplifier for teachers ?
It varies from various producers who embrace different technology and work with different raw materials providers. To be able to make sure the quality of voice amplifier , it's necessary for a professional maker to put necessary investment inraw materials selection before production. In addition to the well-selected materials cost, the manufacture price on it such as especially technology introduction, labour investment, and advanced equipment cost is also important.
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