The HP 7470 was a small low-cost desktop pen plotter introduced by Hewlett Packard's San Diego division in 1982. It was the first small-format plot that moved the paper, rather than the pens.It used a revolutionary "grit wheel" design which moved the paper held in place by a wheel with embedded grit and a pinch roller. Pen plotters became obsolete with the adoption of ink-jet printers, and processors fast enough to rasterize complex images. Houston Instrument and other manufacturers would follow with similar plotters.
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