Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B28
WORKING CEMENT, CLAY, OR STONE
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B28B
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
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B28B7/22
Moulds for making units for prefabricated buildings; , i.e. units each comprising an important section of at least two limiting planes of a room or space, e.g. cells; Moulds for making prefabricated stair units
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