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Automatic dimming table lamp
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Discrete component hearing aid
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Square wave, triangular wave and sine wave signal source
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Pulse type headache physical therapy device
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Power socket with adjustable output voltage
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Time delay illumination switch made of key switch
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Touch control relay switch
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Meow-simulated rat-repelling device
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Electronic auxiliary interpreting device for table top mercurial sphygmomanometer
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Electronic hypnotic machine using only one battery
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Non-contact shutdown reminding device for high-power electrical appliance
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