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Micrometer for directly measuring volume
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Novel solenoid
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A kind of new gas law experiment instrument
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A kind of cost laser level meter
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New pattern laser level meter
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multifunctional protractor
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Multifunctional set square with pointer
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Multifunctional set square
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Novel watering can of watering flowers
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Novel protractor used for teaching
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Novel gradienter
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Measuring instrument with annular horizontal instrument and preparation method thereof
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Measuring tool with liquid declinometer
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Wall socket with night vision function
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Toothpaste tube capable of preventing toothpaste from being sucked back
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Chinese chequer with chequer adsorption devices
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Push-pull type child toy water gun with LED lamps
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Mobile phone support whose support rod is metal bellow
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