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  2. Toner refill - Wikipedia

    en.wikipedia.org/wiki/Toner_refill

    HP, Canon printers; Canon PC copiers; IBM/Lexmark Optra and similar; Epson EPL, NEC Silentwriter; Xerox and Sharp; Samsung and Lexmark Optra E; Brother; Kits are available to refill the 4 toner cartridges used by colour printers (cyan, magenta, yellow and black), or to fill a single cartridge. Kits include a reset chip where necessary.

  3. HP-21 - Wikipedia

    en.wikipedia.org/wiki/HP-21

    The HP-21 was a scientific calculator produced by Hewlett-Packard between 1975 and 1978. [1] It was designed as a replacement for the HP-35 , and was one of a set of three calculators, the others being the HP-22 and HP-25 , which were similarly built but aimed at different markets.

  4. Ink cartridge - Wikipedia

    en.wikipedia.org/wiki/Ink_cartridge

    Two cartridges; one with black ink (a third-party HP 15 compatible cartridge), one with colored inks (an original type HP 17 tri-color cartridge) currently installed in an HP inkjet printer. An ink cartridge or inkjet cartridge is a component of an inkjet printer that contains ink to be deposited onto paper during printing . [ 1 ]

  5. HP-25 - Wikipedia

    en.wikipedia.org/wiki/HP-25

    The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-67. Similar to the way the HP-55 was a cheaper alternative to the HP-65. To reduce cost, the HP-25 omitted the HP-67's magnetic card reader, so it could only be programmed using the keyboard. After switching off, the program was lost and had to be typed in ...