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2. Perforated metal - Wikipedia

   en.wikipedia.org/wiki/Perforated_metal

   Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

4. Metal prices - Wikipedia

   en.wikipedia.org/wiki/Metal_prices

   Metal prices are the prices of metal as a commodity that are traded in bulk at a predefined purity or grade. Metal can be split into three major categories, precious metals, industrial metals and other metals. Precious metals and industrial metals are priced by trading of those metals on commodities exchanges. [1]

5. Micro perforated plate - Wikipedia

   en.wikipedia.org/wiki/Micro_perforated_plate

   One early contributor to the theory of micro perforated plates as sound absorbers was Professor Daa-You Maa. [1] [2] Further possibilities aiming to improve the accuracy of Maa's original model are currently being investigated. One other major phenomenon that currently being investigated is the nonlinear effect i.e. an MPP behaves differently ...

6. Here are things Trump has promised to carry out on Day 1 of ...

   www.aol.com/news/11-things-trump-promised-carry...

   Companies could respond to tariffs by buying a product in the U.S. rather than from another country, or they may raise prices for consumers to offset the cost of the tariff.

7. Corrugated galvanised iron - Wikipedia

   en.wikipedia.org/wiki/Corrugated_galvanised_iron

   Corrugated galvanised iron (CGI) or steel, colloquially corrugated iron (near universal), wriggly tin (taken from UK military slang), pailing (in Caribbean English), corrugated sheet metal (in North America), zinc (in Cyprus and Nigeria) or custom orb / corro sheet (Australia), is a building material composed of sheets of hot-dip galvanised ...