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Rectifying circuit
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Shuttlecock capable of counting
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Corn threshing workbench
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Squeezing type ink bottle
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Automatic rat trap
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Automatic ash handling device of blackboard eraser
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Ceiling fan with telescopic fan blades
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Sleepiness warning device
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Inflatable elastic sneaker
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Corn thresher
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Rapeseed husking device
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Automatic brake device for accelerator misapplication
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