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Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [ 2 ] but may be constructed from precast concrete , glass reinforced plastic or other composite materials (especially where cover theft is of concern).
A manhole cover sits on a metal base, with a smaller inset rim which fits the cover. The base and cover are sometimes called "castings", because they are usually made by a casting process, typically sand-casting techniques. [1] Pick holes in manhole cover, Palo Alto, California, USA Manhole valve made in 2022
Each of Tennessee's 95 counties has at least one listing. The Tennessee Historical Commission, which manages the state's participation in the National Register program, reports that 80 percent of the state's area has been surveyed for historic buildings. Surveys for archaeological sites have been less extensive; coverage is estimated less than ...
Oldest dam in Tennessee is on Big Creek below the house Sinking Creek Baptist Church: Johnson City: 1783 Church Log church Tipton-Haynes House: Johnson City: 1784 Residence Part of Tipton-Haynes State Historic Site Rock Castle (Hendersonville, Tennessee) Hendersonville: 1784-1791 Residence earliest known version of Federal Style architecture in ...
Fulton also invented an automatic river gauge while working for the U.S. Weather Bureau, and played a primary role in the development of the depth charge during World War I. [1] [2] His company, now called Fulton Bellows after numerous ownership changes, still operates in Knoxville, [3] as part of the United Flexible Group, which acquired it in ...
March 5 – Tennessee's first case of COVID-19 is confirmed in Williamson County, marking the start of the COVID-19 pandemic in Tennessee. 2023 March 27 – A mass shooting occurs at a private Presbyterian Church in America parochial school in Nashville, Tennessee, killing three children, three adults, and the perpetrator.
Conquistador Hernando de Soto, first European to visit Tennessee. In the 16th century, three Spanish expeditions passed through what is now Tennessee. [12] The Hernando de Soto expedition entered the Tennessee Valley via the Nolichucky River in June 1540, rested for several weeks at the village of Chiaha (near the modern Douglas Dam), and proceeded southward to the Coosa chiefdom in northern ...
George Roby Dempster (September 16, 1887 – September 18, 1964) was an American businessman, inventor, and politician, active primarily in Knoxville, Tennessee, during the first half of the 20th century.