This is bunker CM-9. The letters CM stand for sector Cognolée-Marchovelette, referring to the forts of which the bunker is a part within La Position Fortifiée de Namur (PFN).
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Source
Text: Ed Lewandowski
Photos: Ed Lewandowski
Namur, ses bunkers et ses P.C. La Position Fortifiée de Namur Sud, F. Vernier.