August 1st, 2011 by
Most of us never think much about our garage doors, or the system that operates them. We drive up, push a button, and watch the door open, drive in, push the button again, and let it close behind us, all without pausing to marvel at the mechanisms that make this convenience possible.
Source:How Your Garage Door Works
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Source: http://home-improvement-power.com/how-your-garage-door-works.html
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