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  2. 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 ...

  3. 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).

  4. Perforation - Wikipedia

    en.wikipedia.org/wiki/Perforation

    Perforation of steel strips is used in the manufacture of some zesters and rasps. Historically, perforation patterns other than linear were used to mark stamps . A series of patents had been issued in the late 19th century for perforation machines to be used on rail lines for ticketing.

  5. Slotted angle - Wikipedia

    en.wikipedia.org/wiki/Slotted_angle

    Slotted angle (also sometimes referred to as slotted angle iron) is a system of reusable metal strips used to construct shelving, frames, work benches, equipment stands and other structures. The name derives, first, from the use of elongated slots punched into the metal at uniform intervals to enable assembly of structures fixed with nuts and ...

  6. Perfboard - Wikipedia

    en.wikipedia.org/wiki/Perfboard

    Top of a copper clad Perfboard with solder pads for each hole. Perfboard is a material for prototyping electronic circuits.It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing.

  7. Trump to announce 25% steel and aluminium tariffs in latest ...

    www.aol.com/news/asian-eu-steelmakers-shares...

    President Donald Trump is expected to introduce new 25% tariffs on Monday on all steel and aluminium imports into the U.S., on top of existing metals duties, in another major escalation of his ...

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