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It looks like they were never used here, even though NBL built them for export. Better off asking where they were designed and mainly used: Australia.
Have you read the wiki article at https://en.wikipedia.org/wiki/SCOA-P_wheel ?
Probably find that the workers at NBL referred to them with a Glaswegian nickname anyway
Unfortunately copying a quote from the file is blocked, but in essence it describes the unique wheel structure and associated weight reduction, and licencing for manufacture
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