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Back2020, 2025 and 2032 coincell batteries. Http://www.keyelco.com/product-pdf.cfm?p=798 Keystone type 105 battery holder Keystone type 1057 coin cell retainer SMT battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 106 battery holder Keystone type 107 battery holder Keystone type 104 battery holder Keystone 2xAAA cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2.
- //non-printing, barely-visible outline of component footprints width .
- Test debouncing. Maybe enlarge.