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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.
Toner cartridges cannot be refilled indefinitely, because mechanical parts such as rollers wear out. Some cartridges include the electro-optical drum, which becomes depleted and can be scratched. Organizations refilling cartridges for resale usually clean and test each cartridge to ensure that it is fit for reuse and resale.
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 ]
During the summer of 2010, the USPS requested the Postal Regulatory Commission to raise the price of a first-class stamp by 2 cents, from 44 cents to 46 cents, to take effect January 2, 2011. On September 30, 2010, the PRC formally denied the request, but the USPS filed an appeal with the Federal Court of Appeals in Washington DC .
A USPS fact sheet about the proposed changes notes that the plan would have no impact on 75% of first-class mail. The combination of higher prices and slower delivery raises the risk that the USPS ...
The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $5,069 in 2024) [ 2 ] , it featured nine storage registers and room for 100 keystroke instructions.