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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B28B7/30
adjustable, collapsible, or expanding
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B28B7/303
specially for making undercut recesses or continuous cavities the inner section of which is superior to the section of either of the mouths
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