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Telephone Off-Hook Indicator PCB pattern (PDF download) [12101001] PCB pattern for the Off-Hook Indicator For Telephone Lines (single-sided). Cat No SC2249. Price: Free Files: Telephone Off-Hook Indicator PCB (12101001).pdf (10.6KB) Related to: Project: Off-Hook Indicator For Telephone Lines (January 2000 [print issue] [online issue]) Other item relevant to this project: Telephone Off-Hook Indicator panel artwork (PDF download) (Free) Add to trolley