EEG, pencil movement:
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Measure pressure, Electronic sphygmomanometer
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Dentist rinsing the mouth with water
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Blood analyzer
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Make a hospital bed
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Hospital, water filtration system
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Respiratory mask
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Sphygmomanometer, measure pressure
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An empty cart for the sick
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Hydraulic hospital bed
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Couch driven patient
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Instrument noise, Laboratory
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Fluoroscopy
★★★★★