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5Sets Magnetic Reed Switch Normally Open Closed NC NO Door Alarm Window Security/Magnetic Door Switch/Magnetic Contact Switch/Reed Switch (5pcs White) : Amazon.ca: Industrial & Scientific
switches - "Normally closed" switch: does it use more power than a "Normally open" for a low-power battery-powered ATtiny project? - Electrical Engineering Stack Exchange
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2 Position Normally Open + Normally Closed key operated Rotary Switch - Metal bezel - Buy Online - EC Products UK
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