it's D page 109 of Tokyo Book. "every hardware item has a unique model number - the manufacturer part number. This number is used to normalize records with inconsistent product names and manufacturers."
From HAM Fundamentals -> Hardware Model Normalization / Overview
As we saw earlier, every hardware item has a unique model number—the manufacturer part number—for specific asset configurations provided by the manufacturer.
This number is used to normalize records with inconsistent product names and manufacturers, and aligns assets under one common Display name that combines the standardized manufacturer, product name, and model number.
D
The model is compared against the data in the Hardware Normalization Content Service. Match criteria is based on Manufacturer, model Name, and Model number. The model is fully Normalized if the information is available.
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