This category is for articles about companies, groups and organizations where the articles do not have a year of establishment because the year is not known and is never likely to be known (e.g. historical organizations). If the year is likely to be known, and could be researched (e.g. contemporary or recent figures), please use Category:Year of establishment missing instead.
Pages in category "Year of establishment unknown"
The following 37 pages are in this category, out of 37 total. This list may not reflect recent changes.
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