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Adjustable window screens nearby pdf#
Google Patents Adjustable screen ventilator for windowsĭownload PDF Info Publication number US2524230A US2524230A US5039A US503948A US2524230A US 2524230 A US2524230 A US 2524230A US 5039 A US5039 A US 5039A US 503948 A US503948 A US 503948A US 2524230 A US2524230 A US 2524230A Authority US United States Prior art keywords ventilator main opening air flange Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US2524230A - Adjustable screen ventilator for windows US2524230A - Adjustable screen ventilator for windows
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