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Does the aroma of your demon curries, garlicky cooking or flatulent pets put visitors off when they come to your front door? Derry Cox of Derbyshire has a simple solution: incorporate an air-freshener in your doorbell. When a visitor rings the bell, the solenoid that moves the bell hammer also presses a plunger onto the aerosol valve of a can of air-freshener. By the time you’ve answered the door, your hallway is fragrant.