H21LTI from onsemi is a SENSOR OPTICL 3.15MM SLOT PC PIN
H21LOB from onsemi is a SENSOR OPTICL 3.15MM SLOT PC PIN
MDM-21SH005L-F222 from ITT Cannon, LLC is a MICRO 21C S 30"" RBW JACKSLP HT
AML21BBA3AB from Honeywell Sensing and Productivity Solutions is a PUSH SWITCH BUTTON SPDT 3A 125V
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