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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 ...
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.
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.
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 ...
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.
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.
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 ]
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.