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Digital Clock with Battery Backup PCB patterns (PDF download) [04101931-3] PCB patterns for the Digital Clock with Battery Back-Up (single-sided). There are three patterns in the PDF. The main board is coded 04101931, the front panel display board 04101932 and the button board 04101933. Cat No SC2559. Price: Free Files: Digital Clock with Battery Backup PCBs (04101931-3).pdf (40.5KB) Related to: Project: A Digital Clock With Battery Back-Up (April 1993 [online issue])