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Ink ribbons are part of standard designs for hand- or motor-driven typewriters, teleprinters, stenotype machines, computer-driven printers, and many mechanical calculators. Thousands of varieties of ink ribbons and ribbon cartridges have been produced, and are available from stationery suppliers.
Smith Corona is an American manufacturer of thermal labels, direct thermal labels, and thermal ribbons used in warehouses for primarily barcode labels.. Once a large U.S. typewriter and mechanical calculator manufacturer, Smith Corona expanded aggressively during the 1960s to become a broad-based industrial conglomerate with products extending to paints, foods, and paper.
HP-19B, introduced on 4 January 1988, along with the HP-17B, HP-27S and the HP-28S, and replaced by the HP-19BII (F1639A) in January 1990, [2] was a simplified Hewlett Packard business model calculator, like the 17B.
A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
Calculators may in some circumstances be used within school and college examinations. In the United Kingdom there are limitations on the type of calculator which may be used in an examination to avoid malpractice. Some calculators which offer additional functionality have an "exam mode" setting which makes them compliant with examination ...
Its production debut of 1851 [2] launched the mechanical calculator industry [4] which ultimately built millions of machines well into the 1970s. For forty years, from 1851 to 1890, [7] the arithmometer was the only type of mechanical calculator in commercial production, and it was sold all over the world. During the later part of that period ...
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