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Harris, Tom. "How Doorbells Work." 10 January 2002. HowStuffWorks.com. <http://home.howstuffworks.com/doorbell.htm> 20 July 2008.

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DOORBELLS

Heath Zenith Trine 172CA Doorbell

DOOR BELL, Manufacturer: Heath Zenith Trine

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$6.39

Chrome Doorbell by Spore

This doorbell has a clear ding dong sound that is certain to delight guests. The unique sound is provided by a stylish 4-1/2-inch diameter bell. It's ...

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$119.95

Doorbell Plate - 1-3/4" - Bronze Patina

This doorbell plate fits most modern push-button doorbells, and is perfect for adding subtle style to your entrance door. Available in two sizes to b...

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$6.95