Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04C
STRUCTURAL ELEMENTS; BUILDING MATERIALS
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2/00
Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
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E04C2/30
characterised by the shape or structure
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E04C2/34
composed of two or more spaced sheet-like parts
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E04C2002/3477
spaced apart by tubular elements parallel to the sheets
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