光学开关（透射型，光电晶体管输出） Slotted Optical Switch
Optical Sensor Through-Beam 0.125" 3.18mm Phototransistor Module, Pre-Wired
得捷:
SENSOR OPT SLOT PHOTOTRANS MODUL
艾睿:
Photointerrupter Transmissive 3.175mm Phototransistor 4-Pin
Allied Electronics:
Sensor, Transmissive, Slotted Optical Switch, 3.18mm Slot, Chassis Mount, 30V
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