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A Hewlett-Packard laser toner cartridge. A toner cartridge, also called laser toner, is the consumable component of a laser printer.Toner cartridges contain toner powder, a fine, dry mixture of plastic particles, carbon, and black or other coloring agents that make the actual image on the paper.
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and copiers produce on every printed page that identifies the specific device that was used ...
In 1925, Rudolf Hell invented the Hellschreiber, an early facsimile-like dot matrix–based teletypewriter device, [6] patented in 1929. Between 1952 and 1954 Fritz Karl Preikschat filed five patent applications [7] [8] for his teletype writer 7 stylus 35 dot matrix aka PKT printer, [6] a dot matrix teletypewriter built between 1954 and 1956 in Germany.
Bottles of ink from Germany Writing ink and a quill. Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, reed pen, or quill.
HP's stated that the firmware was intended to provide "the best consumer experience" and "protect" customers from "counterfeit and third-party ink cartridges that do not contain an original HP security chip and that infringe on our IP." [41] In 2023, PC World reported that HP printers still prevent users from using third-party ink. [42]
A toner cartridge from one of the recovered bombs showing white powder and wiring. Each package contained a Hewlett-Packard HP LaserJet P2055 desktop laser printer. Inside each printer's toner cartridge was a sophisticated bomb. [37] [38] The cartridges were filled with pentaerythritol tetranitrate (PETN).
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