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A kind of hydraulic book binder and its operating method
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A kind of hydraulic book binder
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Combined pen
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Combined pen and its application method
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Multi-functional combined pen
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A kind of door opener and method
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A kind of door opener
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A kind of door opener stopping door
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A kind of test paper binding machine
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A kind of modified form test paper binding machine
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A kind of containing test paper binder
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A kind of window catch of the locking device using wireless control
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A kind of auto-latching type latch based on bioengineering
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A kind of automatic letter box arrangement
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A kind of letter box arrangement
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A kind of sleeping bag
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A kind of travel sleeping bag
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A kind of screen
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A kind of screen using 3D printing
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