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  2. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system , as a safety interlock , or as a counter enumerating objects passing a point.

  3. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    A telephone switch is the switching ... exactly as a call to LEnnox 5813, in an automated exchange. ... in Sweden in the 1970s as a replacement for the very popular ...

  4. Lennox International - Wikipedia

    en.wikipedia.org/wiki/Lennox_International

    Lennox International Inc. is a provider of climate control products for the heating, ventilation, air conditioning, (in the complex colloquially called: HVAC) and refrigeration markets. The company is based outside Dallas, Texas in the United States and has operations globally.

  5. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic ...

  6. Infinite switch - Wikipedia

    en.wikipedia.org/wiki/Infinite_switch

    An early switch operating by this principle was invented by Chester I. Hall of the General Electric Company, with a patent filed in 1921 and approved in 1924.Like the modern infinite switch, Hall's invention used a bi-metallic strip, heated by a constant current, to break a connection after a given period of time.

  7. IN THE UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT ...

    images.huffingtonpost.com/2011-08-05-Joliet...

    3 funding pursuant to the HCDA totaling approximately $928,723 and $1,005,986, respectively. As part of the receipt of those federal funds, the City has an obligation to affirmatively further

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