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Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04C
STRUCTURAL ELEMENTS; BUILDING MATERIALS
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1/00
Building elements of block or other shape for the construction of parts of buildings
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E04C1/24
Elements for building-up floors, ceilings, roofs, arches, or beams
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E04C1/34
designed for use as filling elements
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