| 摘要 |
634,689. Floor or roof slabs. THOMSON, W. R., and COOPER, H. J. GOUGH-. Aug. 15, 1947, No. 22790. [Class 87 (i)] A reinforced concrete floor or roof slab 1 to span between two walls is formed with a peripheral rib 2, having on two sides of the slab projecting lugs 6 which rest on the walls, and intermediate ribs 7.
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