"PA"@en-us . "P.A."@en-us . . . "an electronic amplification system used as a communication system in public areas"@en-us . . . "PA system"@en-us . "0"^^ . . . . "04018155-n"^^ . . . . . . . "P.A. system"@en-us . . . "0"^^ . "103866285"@en-us . "104018155"^^ . "103183561"@en-us . . . "public address system"@en-us . "public address system"^^ . .