Manufacture of light-weight concrete building units
1,096,854. Cutting concrete blocks. DUROX INTERNATIONAL S.A. Jan. 18, 1965 [Feb. 20, 1964 (2)], No. 2170/65. Heading B5A. A concrete block (in plastic condition) is cut into building units by first cutting the block into intermediate blocks by means of vertical cutting wires extending through parall...
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