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Product-resume tracing method in which a product application identifier is developed to use in combination with block chain for tracing, in a non-modifiable manner, a specific product through production, warehousing, and distribution
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Earphone bass boosting device and earphone with same
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A kind of language of instruction sound introduction system based on wireless network
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A kind of guide system that the scenic spot based on AR technology is visited
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A kind of knowledge road navigation feature speech guide device
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A kind of kitchen air purifying filter device
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Air purifier
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Atomizing air clarifier
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A kind of seafood fermented soya bean sauce and preparation method thereof
