The 9-1-1/ PBX Problem - And A Solution, Too

Magazine Title: APCO BULLETIN
Author(s): Paul D. Linnee
Date: 1993-01
Volume: 59
Issue: 1
Page(s): 14,44,45,51
Article(s): 1993-01-014.200.pdf, 1993-01-044.200.pdf, 1993-01-045.200.pdf

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