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PBX may refer to: Pakubuwono X, the tenth Susuhunan of Surakarta in Java, Indonesia Polymer-bonded explosive Pre-B-cell leukemia homeobox Private branch exchange, a telephone exchange that serves a particular business or office PBX Funicular Intaglio Zone, a 2012 album by John Frusciante PBX, a rewrite of the Project Builder IDE for Mac OS X systems, now known as Xcode PhotoBox, a digital photo printing service