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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E04C3/02
Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms;; Braces
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E04C3/28
of materials not covered by groups E04C3/04 - E04C3/20
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