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Battery CR-2450 coin cell retainer Keystone 3034 SMD battery holder Keystone Battery Holder SMD Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button switch | | | | | | U3 | 1 | 100k | Resistor | | R4, R12, R13 | 3.

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