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The Historical Marker Database (HMdb.org) is an online database that documents locations of numerous historical markers and commemorative plaques in the United States as well as other countries. The database was launched in 2006 by computer programmer J. J. Prats. [1]
Laser engraving metal plates are manufactured with a finely polished metal, coated with an enamel paint made to be "burned off". At levels of 10 to 30 watts, excellent engravings are made as the enamel is removed quite cleanly. Much laser engraving is sold as exposed brass or silver-coated steel lettering on a black or dark-enamelled background.
Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...
Also known as "Cullum Memorial Hall," this building contains plaques that include the names of all West Point graduates killed in action from 1812 to the present. These plaques are located in the newly designed Memorial Room, dedicated on 10 November 2014. [38]
As of 2021, there were 321 combined Roadside (larger) and City (narrower) markers affixed on posts and Plaque markers affixed to buildings or structures in Philadelphia County, Pennsylvania, which is coterminous with the city of Philadelphia.
Lunar plaques are stainless steel commemorative plaques measuring 9 by 7 + 5 ⁄ 8 inches (22.9 by 19.4 cm) attached to the ladders on the descent stages of the United States Apollo Lunar Modules flown on lunar landing missions Apollo 11 through Apollo 17, to be left permanently on the lunar surface.
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