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  2. Vacuum interrupter - Wikipedia

    en.wikipedia.org/wiki/Vacuum_interrupter

    In 1956, Hugh C. Ross at Jennings Radio Manufacturing Corporation revolutionized the high-frequency-circuit vacuum switch and produced a vacuum switch with a rating of 15 kV at 200 A. Five years later, Thomas H. Lee at General Electric produced the first vacuum circuit breakers [2] [3] with a rated voltage of 15 kV at short-circuit breaking ...

  3. Vacuum breaker - Wikipedia

    en.wikipedia.org/wiki/Vacuum_breaker

    A vacuum breaker is a device that prevents water from being siphoned backward in a direction it is not desired to go. They are commonly placed on a bibcock valve or toilet or urinal flush valve , in which application they can prevent hose or drainage water from back-siphoning into the public drinking water system.

  4. Atmospheric vacuum breaker - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

    An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water system.

  5. Pressure vacuum breaker - Wikipedia

    en.wikipedia.org/wiki/Pressure_vacuum_breaker

    A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply. A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet. This makes it acceptable for applications that are high hazard or where valves are ...

  6. List of Milwaukee Road locomotives - Wikipedia

    en.wikipedia.org/wiki/List_of_Milwaukee_Road...

    Milwaukee Road class EF-4 - "Little Joes". 10 examples built by GE in 1946 for the Soviet Ministry of Railways as Class A. In addition, the EP-4 locomotives were converted to EF-4 specification in 1956. Milwaukee Road class EF-5 - Four-unit boxcab sets formed with any combination of regular or bobtail units in the middle.

  7. Circuit breaker - Wikipedia

    en.wikipedia.org/wiki/Circuit_breaker

    Vacuum circuit breakers—With rated current up to 6,300 A, and higher for generator circuit breakers application (up to 16,000 A & 140 kA). These breakers interrupt the current by creating and extinguishing the arc in a vacuum container – aka "bottle". Long life bellows are designed to travel the 6–10 mm the contacts must part.

  8. USCGC Westwind - Wikipedia

    en.wikipedia.org/wiki/USCGC_Westwind

    On 21 February 1945 the ship was transferred to the Soviet Union and renamed Severni Polius (North Pole, Russian: Северный Полюс). [ 7 ] [ 8 ] On 19 December 1951, the ship was returned to the United States Coast Guard , [ 7 ] [ 8 ] and recommissioned as the Westwind on 22 September 1952 after a refit. [ 8 ]

  9. WMKE-CD - Wikipedia

    en.wikipedia.org/wiki/WMKE-CD

    WMKE-CD (channel 21) is a low-power, Class A television station in Milwaukee, Wisconsin, United States. [2] Owned by CNZ Communications, it has studios on West Stratton Drive in suburban New Berlin and a transmitter at the Milwaukee PBS tower on Milwaukee's northeast side.