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Back(https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T tactile switch SPST angled PTS645VL39-2 LFS C&K Button tactile switch SPST LED OFF-ON lamp D Single Pole Single Throw (SPST) switch, small symbol D Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>