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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B28B7/16
Moulds for making shaped articles with cavities or holes open to the surface; , e.g. with blind holes
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B28B7/168
for holders or similar hollow articles, e.g. vaults, sewer pits
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