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3303581
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Patent Grant
3303581
References
Source
Patent Number
3,303,581
Date Filed
Not available
Date Issued
Tuesday, February 14, 1967
57 years ago
CPC
E06B3/9684 - by hooking protrusions on the connecting piece in openings of the frame member
US Classifications
434 - Education and demonstration
D25 - Building units and construction elements
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