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Phone Line Polarity Checker PCB pattern (PDF download) [12105111] PDF with the PCB design for the Phone Line Polarity Checker (single-sided). Cat No SC0943. Price: Free Files: 12105111.pdf (12.7KB) Related to: Project: Phone Line Polarity Checker (May 2011 [print issue] [online issue]) Other item relevant to this project: Phone Line Polarity Checker PCB [12105111] ($10.00) Add to trolley