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https://en.wikipedia.org › wiki › Marston_mat
Marston Mat - Wikipedia
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 landing strips (also misspelled as Marsden matting ).
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I'd suspect steel strips were rolled into contour, punched and dimple died in a series of passes. Hot rod parts are one-offs.
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