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Acoustic ducts (Pbpbdcb)

Facilities (P)
     Use For: Complexes; Installations
    Structures (Pb)
         Use For: Buildings
        Structural parts (Pbp)
             Related Term (Associative): Equipment (Qt)
            Structural members (Pbpb)
                 Related Term (Associative): Materials by shape or form (Rbmdx)
                Conduits (Pbpbd)
                    Ducts (Pbpbdc)
                        Acoustic ducts (Pbpbdcb)
                        Diffusers (Pbpbdce)