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What is a normally open and normally closed switch, limit switch, and relay? - with tutorial. - YouTube
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Amazon.com: LONYE KW3A Microwave Oven Door Switch Fit for Microwave DR52 16A 125/250V(Normally Open & Normally Close) : Home & Kitchen
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Amazon.com: KW3A Microwave Oven Door Switch 16A 125V/250V Door Interloc (2 Normally Open and 1 Normally Close) : Home & Kitchen
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