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For example, there are alot of products that I sell which have changed just slightly over the years, after each change the manufacture makes, they assign a new part number. Many people find my site via searching for the part number alone. However, people don't just search using the most current part number. More often than not they search using an older part number. If I implemented a tag word feature, I could simply add all of these part numbers to a designated area on the page.
In any case, what do you all think about this? Is there a good chance that this will upset Googlebot?