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5pcs Reed Switch 3 pin Magnetic Switch 2.5*14mm Normally Open Normally Closed Conversion 2.5X14MM NO NC Conversion for Sensors|Switches| - AliExpress
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Reed switch magnetic sensor - MK21P, MK21M Series - StandexMeder Electronics GmbH - for high-temperature
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Amazon.com: Baomain Magnetic Reed Sensor Switch D-A93 DC AC 5-240V 200mA Sensor 10mm NO(Normally Open) for Pneumatic Air Cylinder : Industrial & Scientific
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