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United States Patent No.6,854,211, No.6,622,433, No. 7,055,231, plus on going pending and foreign applications pursuant to US patent treaties. |
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Patented design features |
DuraShutter™ |
Other brands |
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No staple or louver tilt pins to loosen, fall out, or break |
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Best ~ Insulating, Light blocking, and Noise reduction technology |
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$30,000 |
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5000 s-f |
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14 |
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39 |
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yes |
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