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VEYFIY LED Floor Lamp, 12W Swing Arm Lamp with 5 Color Temperatures,Stepless Dimmer, Standing Light with 360 Degree Swing Arms,Modern Lamps for Work,Living Room,Sewing,Craft,ETL Listed,Black - Amazon.com
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Figure 4 from The spring-and-lever balancing mechanism, George Carwardine and the Anglepoise lamp | Semantic Scholar
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