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BackHolder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 106 battery holder for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder Keystone type 2998 battery holder Keystone 2xAAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Side-actuated Model, with Ground Terminal, with Boss SPST button tactile switch switch normally-open pushbutton push-button D MEC 5G single pole double throw D Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8