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Amazon.com: Heschen M18 Capacitive Proximity Sensor Switch Non-Shield Type LJC18A3-B-Z/AX Detection 10mm 10-30VDC 200mA NPN Normally Closed(NC) 3 Wires : Industrial & Scientific
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Amazon.com: PEPPERL & FUCHS NJ-15-U4-W Discontinued by Manufacturer, Proximity Switch, 500 MA, 3 AMP, INDUCTIVE Sensor, 15 MM Range Flush, 45-65 HZ, 20-253 VAC : Industrial & Scientific
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Inductive Proximity Sensor Switch M30 Detect Metal Sensor Switches 12v Dc 220v Ac Npn Pnp No Nc 8mm 10mm 15mm Detection Distance - Switches - AliExpress
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