United States Patent Number 6,199,617, and their most recent Patent 6,866,080 granted on March 15, 2005 entitled: Method and apparatus of Opening and Closing a Bi-Fold door."
United States Patent Number 6,199,617, and their most recent Patent 6,866,080 granted on March 15, 2005 entitled: Method and apparatus of Opening and Closing a Bi-Fold door."
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