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10Pcs 5/32"Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY301-19 - Black - 0.9" x 0.5" x 0.2"(L*W*H) - Overstock - 25414779
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uxcell 10 Pcs 5/16" Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY860H-A - - Amazon.com
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