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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

   Perforated metal, also known as perforated sheet, perforated plate, or perforated screen, is sheet metal that has been manually or mechanically stamped or punched using CNC technology or in some cases laser cutting to create different holes sizes, shapes and patterns. Materials used to manufacture perforated metal sheets include stainless steel ...

4. Perforated hardboard - Wikipedia

   en.wikipedia.org/wiki/Perforated_hardboard

   A close-up view of a sheet of pegboard. Perforated hardboard is tempered hardboard which is pre-drilled with evenly spaced holes. The holes are used to accept pegs or hooks to support various items, and perforated hardboards are therefore used for purposes such as tool boards in workshops. Peg-Board is an expired trademark used as a brand name ...

5. Sheet metal - Wikipedia

   en.wikipedia.org/wiki/Sheet_metal

   Sheet metal - Wikipedia ... Sheet metal

6. John R.F. Jeffreys - Wikipedia

   en.wikipedia.org/wiki/John_R.F._Jeffreys

   Jeffreys's perforated sheets were used by Polish cryptologists in exile in France to make the first wartime decryption of an Enigma message on 17 January 1940. [ 8 ] In early 1940, a section called " Hut 6 " — named after the building in which it was initially housed — was created to work on solving German Army and Air Force Enigma messages.

7. Micro perforated plate - Wikipedia

   en.wikipedia.org/wiki/Micro_perforated_plate

   Micro perforated plate. A micro perforated plate ( MPP) is a device used to absorb sound, reducing its intensity. It consists of a thin flat plate, made from one of several different materials, with small holes punched in it. An MPP offers an alternative to traditional sound absorbers made from porous materials.