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High-efficient sawtooth drill bit
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Television advertisement cross switching system
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Semi-submersible type full-interchange urban interchange
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Lever operated bicycle
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Rapid folding method for bicycle and apparatus therefor
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Method for automatically cleaning oil smoke and fume exhaustor thereof
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Ventilator with mobile ventiduct
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On-screen display system for draft typewriting
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Method of filtering oil fume by metal oil screen and easily cleaning oil screen thereof
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V-shape rotating gate
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Rotary type easily-cleaning detaching-free oil net
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Stereo air curtain cooking fume remover structure
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Easy-cleaning removal-free oil-net structure
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Stereo air curtain oil smoke guiding and exhausting method and oil smoke guiding and exhausting machine
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