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Heavy-Duty Magnetic Garage Door Switch-N.O. Contact for N.C. CircuitsOVERHEAD DOOR MOUNT NC CONTACT MAGNET MAGNET MOUNTED ON L BRACKET CONTACT IN DIE CAST ALUMINUM HOUSING WITH PRE WIRED 2Features of Heavy-Duty Magnetic Garage Door Switch-N.O. Contact for N.C. Circuits Seco-Larm SM-226LQSpecification of Heavy-Duty Magnetic Garage Door Switch-N.O. C..