MAKE A MEME View Large Image PSTN office classification hierarchy.svg U S PSTN telephone switch hierarchy Self-made in Inkscape based on a diagram in enwp en Image PSTN office classification hierarchy png 2007-08-18 Mysid PSTN Check categories 2015 July 1 Telephones
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Keywords: PSTN office classification hierarchy.svg U S PSTN telephone switch hierarchy Self-made in Inkscape based on a diagram in enwp en Image PSTN office classification hierarchy png 2007-08-18 Mysid PSTN Check categories 2015 July 1 Telephones
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