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Amazon.com: uxcell LJ12A3-4-Z/BY 3-Wire PNP NO 4MM Inductive Proximity Sensor Detection Switch DC6-36V 300mA 4ft : Industrial & Scientific
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Amazon.com: Heschen M12 Inductive Proximity Sensor Switch Non-Shield Type LJ12A3-4-Z/AY Detector 4mm 10-30VDC 200mA PNP Normally Closed(NC) 3 Wire : Industrial & Scientific
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