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2722721
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Information
Patent Grant
2722721
References
Source
Patent Number
2,722,721
Date Filed
Not available
Date Issued
Tuesday, November 8, 1955
69 years ago
CPC
E06B3/7015 - characterised by the filling between two external panels
E04F21/0007 - for mounting doors, windows or frames; their fitting
E06B2003/7094 - with ventilated innerspace
E06B2003/7098 - with bracing means crossing each other
US Classifications
052 - Static structures
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