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Parker-Hannifin Corporation, originally Parker Appliance Company, usually referred to as just Parker, is an American corporation specializing in motion and control technologies. Its corporate headquarters are in Mayfield Heights, Ohio , in Greater Cleveland (with a Cleveland mailing address).
Schematic 3 way ball valve: L-shaped ball right, T-shaped left. Valves with three ports serve many different functions. A few of the possibilities are listed here. Three-way ball valves come with T- or L-shaped fluid passageways inside the rotor. The T valve might be used to permit connection of one inlet to either or both outlets or connection ...
It was a simple cylindrical plastic cap and barrel roller-ball pen called the "Parker RB1". [27] In 1984, Parker added the FP1 ("Fountain Pen 1"), with essentially the same design. The RB1 and FP1 models were produced until 1986, at which time Parker revised the pen by lengthening the cap and shortening the barrel and renaming the new pen the ...
1904: Vacuum tube (or valve) invented by John Ambrose Fleming (1849–1945). 1907: First reported observation of electroluminescence from a diode by H. J. Round (1881–1966); Round's discovery led to the creation of the light-emitting diode. 1917 onwards: Radio guidance systems pioneered by Archibald Low (1888–1956).
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United States v. Carolene Products Company, 304 U.S. 144 (1938), was a case of the United States Supreme Court that upheld the federal government's power to prohibit filled milk from being shipped in interstate commerce.
Arizona State Legislature v. Arizona Independent Redistricting Commission, 576 U.S. 787 (2015), was a United States Supreme Court case where the Court upheld the right of Arizona voters to remove the authority to draw election districts from the Arizona State Legislature and vest it in an independent redistricting commission. [1]
Watt in 1982. In 1978, Watt and Boon formed a band called The Reactionaries with drummer George Hurley and vocalist Martin Tamburovich. [1] The band later became Minutemen with another drummer named Frank Tonche, who only lasted two shows with the group; [11] Hurley, who had been in the short-lived new wave group Hey Taxi! at the time Minutemen first formed, rejoined Watt and Boon. [11]