Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04C
STRUCTURAL ELEMENTS; BUILDING MATERIALS
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3/00
Structural elongated elements designed for load-supporting
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E04C3/38
Arched girders or portal frames
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E04C3/46
of materials not covered by groups E04C3/40 - E04C3/44; of a combination of two or more materials
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