光学开关（透射型，光电晶体管输出） Slotted Opt. Switch
Optical Sensor Through-Beam 0.125" 3.18mm Phototransistor PCB Mount
得捷:
SENSOR OPT SLOT PHOTOTRAN PCB MT
贸泽:
光学开关（透射型，光电晶体管输出） Slotted Opt. Switch
艾睿:
Photointerrupter Transmissive 3.175mm Phototransistor 4-Pin
Allied Electronics:
Sensor, Slotted Optical Switch, 3.18mm Slot, 2V Emitter, 50V Detector, 100 mW
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