Overhead Roll-Up Door Having At Least Two Motors
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United States of America Patent
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Issued Date -
May 9, 2013
app pub date -
Dec 21, 2011
filing date -
Nov 4, 2011
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Abstract
An overhead roll-up door assembly for a vertically moving door to permit and prohibit access to an opening, the door assembly having a flexible door panel, a shaft capable of rotating to vertically move the flexible door panel, and at least two motors configured to rotate the shaft.
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