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electric mower suitable for different terrains
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A kind of Simple water saving type pot flowers sprinkler
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A kind of Simple water electrolysis experimental apparatus
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A kind of simple and direct efficient hydrogen explosion experimental provision
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A kind of fire-fighting principle experimental provision of walk away safety
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A kind of Simple blood transfusion inflating bag
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The graduated double lumen catheter of a kind of band
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A kind of blockage resisting Medicated needle of syringe
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