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  BK-A04 Screw-adjustable lunch break chair
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  BK-A05 Screw-adjustable non-storage lunch break chair
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  BK-A06 Screw-adjustable armless no storage lunch break chair
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  BK-B01 Hand-operated height-adjustable desk and chair
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  BK-B02 Screw-adjustable desk and chair
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  BK-B03 Hand-cranked desk and chair
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  BK-B12 Steel-plastic desks and chairs
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  BKW-A02 Screw-adjustable desk and chair
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  BKW-A04 Screw-adjustable desk and chair
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  BR-222 Household variable-frequency central air conditioning (multi-split) training device
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  BR-DT01 Elevator Installation and Maintenance Training Device
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  Diesel engine dissection model

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