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  2. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The comptometer-type calculator was the first machine to receive an all-electronic calculator engine in 1961 (the ANITA mark VII released by Sumlock comptometer of the UK). In 1890 W. T. Odhner got the rights to manufacture his calculator back from Königsberger & C , which had held them since it was first patented in 1878, but had not really ...

  3. List of physics mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_physics_mnemonics

    ROYGBIV (in reverse VIBGYOR) is commonly used to remember the order of colors in the visible light spectrum, as seen in a rainbow.. Richard of York gave battle in vain" (red, orange, yellow, green, blue, indigo, violet).

  4. Color television - Wikipedia

    en.wikipedia.org/wiki/Color_television

    An RCA Victor Color TV ad featuring milliner Lilly Daché in 1959. Color television (American English) or colour television (Commonwealth English) is a television transmission technology that includes color information for the picture, so the video image can be displayed in color on the television set.

  5. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    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 ...

  6. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...

  7. Commercial and Government Entity code - Wikipedia

    en.wikipedia.org/wiki/Commercial_and_Government...

    CAGE codes are all five characters in length. [3] There is no meaning encoded in the code itself, other than the underlying NCB; it is simply a unique identifier. [4] The Code Chart provided by the NATO AC/135 committee (the group of National Directors on Codification) provides the syntax of CAGE codes in various countries. [5]

  8. Electrical resistance and conductance - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistance_and...

    A 75 Ω resistor, as identified by its electronic color code (violet–green–black–gold–red). An ohmmeter could be used to verify this value.. Substances in which electricity can flow are called conductors.

  9. RKM code - Wikipedia

    en.wikipedia.org/wiki/RKM_code

    Some manufacturers also used the production date code as a stand-alone code to indicate the production date of integrated circuits. [33] Some manufacturers specify a three-character date code with a two-digit week number following the year letter. [34] IEC 60062 also specifies a four-character year/week code.