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Share: COSTA MESA, Calif., April 22, 2021 /PRNewswire-PRWeb/ Since its completion in 1965, St. Louis Gateway Arch has been a shining icon of the Midwest, commemorating the United States westward expansion and the area s role as a center of commerce to points west, as well as southward down the Mississippi River. However, its sheen has been somewhat diminished over the last half century due to atmospheric pollution, the attentions of millions of tourists and, even from the methods used in its construction. At the upper levels of the monument, the stainless steel cladding shows signs of weathering and discoloration, including marks left on the surface by the machinery and crews who built it. Down at the base, deicing salt, visitors hands and even graffiti have likewise left their marks.

Mary chengAstro pakAssociation for preservation technologyLoui gateway archUnited statePreservation technologyConservation management planGateway archமேரி செங்ஆஸ்ட்ரோ பக்சங்கம் க்கு ப்ரிஸர்வேஶந் தொழில்நுட்பம்லூயி நுழைவாயில் வளைவுஒன்றுபட்டது நிலைப்ரிஸர்வேஶந் தொழில்நுட்பம்பாதுகாப்பு மேலாண்மை திட்டம்நுழைவாயில் வளைவு