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  2. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    Tachometer. A tachometer that can indicate up to 7000 RPM (left) A tachometer ( revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays ...

  3. CEN/TC 12 - Wikipedia

    en.wikipedia.org/wiki/CEN/TC_12

    CEN/TC 12 ( CEN Technical Committee 12) is a technical decision-making body within the CEN system working on materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries in the European Union. Its goal is to develop standards for materials, equipment, and offshore structures used in the drilling ...

  4. Photochemical machining - Wikipedia

    en.wikipedia.org/wiki/Photochemical_machining

    Photochemical machining. Photochemical machining ( PCM ), also known as photochemical milling or photo etching, is a chemical milling process used to fabricate sheet metal components using a photoresist and etchants to corrosively machine away selected areas. This process emerged in the 1960s as an offshoot of the printed circuit board industry.

  5. European Committee for Standardization - Wikipedia

    en.wikipedia.org/wiki/European_Committee_for...

    The European Committee for Standardization ( CEN, French: Comité Européen de Normalisation) is a public standards organization whose mission is to foster the economy of the European Single Market and the wider European continent in global trading, the welfare of European citizens and the environment by providing an efficient infrastructure to ...

  6. List of CEN technical committees - Wikipedia

    en.wikipedia.org/wiki/List_of_CEN_technical...

    The following Technical Committees exist or existed within CEN: [4] Basic standards. Drawing practice. Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin. Gas-fired sorption appliances, indirect fired sorption appliances, gas-fired endothermic engine heat pumps and domestic gas-fired washing ...

  7. Photodetector - Wikipedia

    en.wikipedia.org/wiki/Photodetector

    Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. [1] There are a wide variety of photodetectors which may be classified by mechanism of detection, such as photoelectric or photochemical effects, or by various performance metrics, such as spectral response. Semiconductor -based photodetectors ...

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