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The HP 7470 was a small low-cost desktop pen plotter introduced by Hewlett-Packard's San Diego division in 1982. [1] It was the first small-format plot that moved the paper, rather than the pens. [2] It used a revolutionary "grit wheel" design which moved the paper held in place by a wheel with embedded grit and a pinch roller.
Hewlett-Packard 9862A calculator plotter drawing a Lorenz attractor. A plotter is a machine that produces vector graphics drawings. Plotters draw lines on paper using a pen, or in some applications, use a knife to cut a material like vinyl or leather. In the latter case, they are sometimes known as a cutting plotter.
The blueprint process is based on a photosensitive ferric compound. The best known is a process using ammonium ferric citrate and potassium ferricyanide. [6] [7] The paper is impregnated with a solution of ammonium ferric citrate and dried. When the paper is illuminated, a photoreaction turns the trivalent ferric iron into divalent ferrous iron.
Printer Notes: In HP printers introduced since ca 2006, alpha codes indicate product groupings and optional features, thus for example: [3] * Lead alpha codes: A – HP Photosmart Axxx Compact/Portable photo printer
exited printer business Citizen: serial matrix Codimag Waterless Offset Printing Cognitive thermal Colorjet Compuprint Computer Peripherals Inc: merged into Centronics Comtec Mobile printers acquired by Zebra Compress UV Printers Flat bed uv printers - commercial Now available in USA Copal acquired by Nidec to form Nidec Copal: Control Data ...
The light sensitivity of the chemicals used was known in the 1890s and several related printing processes were patented at that time. Whiteprinting replaced the blueprint process for reproducing architectural and engineering drawings because the process was simpler and involved fewer toxic chemicals. A blue-line print is not permanent and will ...
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