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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E04C2/38
with attached ribs, flanges, or the like, e.g. framed panels
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E04C2/384
with a metal frame
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