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  2. Pepperl+Fuchs - Wikipedia

    en.wikipedia.org/wiki/Pepperl+Fuchs

    Acquisitions included Visolux from Berlic, Elcon from Milan, and the proximity switches and photoelectric sensors division from Honeywell International. [4] In 2010, Pepperl+Fuchs further expanded by acquiring Siemens' proximity switch business, enhancing its capabilities in ultrasonic sensor technology. [16]

  3. United States Space Surveillance Network - Wikipedia

    en.wikipedia.org/wiki/United_States_Space...

    The United States Department of Defense (DoD) has maintained a database of satellite states since the launch of the first Sputnik in 1957, known as the Space Object Catalog, or simply the Space Catalog. These satellite states are regularly updated with observations from the Space Surveillance Network, a globally distributed network of ...

  4. Proximity card - Wikipedia

    en.wikipedia.org/wiki/Proximity_card

    A proximity card or prox card [1] also known as a key card or keycard is a contactless smart card which can be read without inserting it into a reader device, as required by earlier magnetic stripe cards such as credit cards and contact type smart cards. [2] The proximity cards are part of the contactless card technologies.

  5. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    An inductive sensor is a device that uses the principle of electromagnetic induction to detect or measure objects. An inductor develops a magnetic field when an electric current flows through it; alternatively, a current will flow through a circuit containing an inductor when the magnetic field through it changes.

  6. Hall effect sensor - Wikipedia

    en.wikipedia.org/wiki/Hall_effect_sensor

    Hall sensors are used for proximity sensing, positioning, speed detection, and current sensing applications [1] and are common in industrial and consumer applications. Hundreds of millions of Hall sensor integrated circuits (ICs) are sold each year [ 2 ] by about 50 manufacturers, with the global market around a billion dollars .

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