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  2. PFD allowance - Wikipedia

    en.wikipedia.org/wiki/PFD_allowance

    PFD allowance in work systems is the adjustment done to the normal time to obtain the standard time for the purpose of recovering the lost time due to personal needs, fatigue, and unavoidable delays. [1]

  3. Mean time between failures - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_failures

    The Mil-HDBK-217 reliability calculator manual in combination with RelCalc software (or other comparable tool) enables MTBF reliability rates to be predicted based on design. A concept which is closely related to MTBF, and is important in the computations involving MTBF, is the mean down time (MDT). MDT can be defined as mean time which the ...

  4. List of free and open-source software packages - Wikipedia

    en.wikipedia.org/wiki/List_of_free_and_open...

    This is a list of free and open-source software packages , computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software ; the GNU project in particular objects to their works being referred to as open-source . [ 1 ]

  5. Programmable calculator - Wikipedia

    en.wikipedia.org/wiki/Programmable_calculator

    Originally, calculator programming had to be done in the calculator's own command language, but as calculator hackers discovered ways to bypass the main interface of the calculators and write assembly language programs, calculator companies (particularly Texas Instruments) began to support native-mode programming on their calculator hardware ...

  6. Busicom - Wikipedia

    en.wikipedia.org/wiki/Busicom

    Their first calculator with a microprocessor is the Busicom 141-PF. Their entry based calculators, the Busicom LE-120A (Handy-LE) and LE-120S (Handy) , [ 6 ] were the first to fit in a pocket and also the first calculators to use an LED display.

  7. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...

  8. Casio calculator character sets - Wikipedia

    en.wikipedia.org/wiki/Casio_calculator_character...

    Download as PDF; Printable version; In other projects ... Casio calculator character sets are a group of character sets used by various Casio calculators and pocket ...

  9. List of mathematical series - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_series

    This list of mathematical series contains formulae for finite and infinite sums. It can be used in conjunction with other tools for evaluating sums. Here, is taken to have the value